US20050122723A1 - Decorative light strings and repair device - Google Patents
Decorative light strings and repair device Download PDFInfo
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- US20050122723A1 US20050122723A1 US10/961,302 US96130204A US2005122723A1 US 20050122723 A1 US20050122723 A1 US 20050122723A1 US 96130204 A US96130204 A US 96130204A US 2005122723 A1 US2005122723 A1 US 2005122723A1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/04—Fastening of light sources or lamp holders with provision for changing light source, e.g. turret
- F21V19/047—Fastening of light sources or lamp holders with provision for changing light source, e.g. turret by using spare light sources comprised in or attached to the lighting device and being intended to replace a defect light source by manual mounting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/10—Lighting devices or systems using a string or strip of light sources with light sources attached to loose electric cables, e.g. Christmas tree lights
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
- F21S9/04—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a generator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/04—Fastening of light sources or lamp holders with provision for changing light source, e.g. turret
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/183—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using impacting bodies
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/10—Circuits providing for substitution of the light source in case of its failure
- H05B39/105—Circuits providing for substitution of the light source in case of its failure with a spare lamp in the circuit, and a possibility of shunting a failed lamp
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/23—Responsive to malfunctions or to light source life; for protection of two or more light sources connected in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V15/00—Protecting lighting devices from damage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/0005—Fastening of light sources or lamp holders of sources having contact pins, wires or blades, e.g. pinch sealed lamp
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2121/00—Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
- F21W2121/04—Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00 for Christmas trees
Definitions
- the present invention relates to decorative lights, including lights for Christmas trees, including pre-strung or “pre-lit” artificial trees.
- one or more strings of decorative lights are supplied with power by converting a standard residential electrical voltage to a low-voltage, and supplying the low-voltage to at least one pair of parallel conductors having multiple decorative lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors.
- a string of decorative lights embodying this invention comprises a power supply having an input adapted for connection to a standard residential electrical power outlet, the power supply including circuitry for converting the standard residential voltage to a low-voltage e.g.
- the lights preferably require voltages of about 6 volts or less, and are preferably connected in parallel groups of 2 to 5 lights per group with the lights within each group being connected in series with each other.
- a supply providing low-voltage DC is used in combination with a string having dual-bulb sockets and associated diode pairs to permit different decorative lighting effects to be achieved by simply reversing the direction of current flow in the string, by changing the orientation of the string plug relative to the power supply.
- one or more strings of decorative lights are supplied with power by a power supply including either circuitry for converting the standard residential voltage to one or more DC voltages and circuitry for switching the polarity and/or amplitude of the DC voltage(s), or circuitry for allowing only a predetermined portion of every AC cycle of an AC voltage source to reach the multiple lights.
- a string of decorative lights in another embodiment, includes a plurality of elongated electrical conductors having multiple electrical lamps inserted into sockets. The multiple electrical lamps and sockets are connected at intervals along the lengths of the conductors.
- a small compartment is also included and includes a wall forming a first opening adapted to receive in frictional engagement a base of an electrical lamp. The compartment also includes a first member designed to engage a second member on the socket to assist in removing the electrical lamp from the socket.
- FIG. 1 is a schematic diagram of a string of decorative lights embodying the present invention
- FIG. 2 is a more detailed diagram of the light string shown in FIG. 1 ;
- FIG. 3 is an enlarged and more detailed perspective view of a portion of the light string of FIG. 2 ;
- FIG. 4 is an exploded perspective view of a bulb and socket for use in the light string of FIGS. 1-3 ;
- FIG. 5 is a schematic circuit diagram of a suitable power supply for use in the light string of FIGS. 1-3 ;
- FIG. 6 is a front elevation of a power supply for supplying multiple light strings on a prelit artificial tree
- FIG. 7 is a side elevation of the power supply of FIG. 6 ;
- FIG. 8 is a top plan view of the power supply of FIG. 6 ;
- FIG. 9 is an exploded perspective view of bulbs and a modified socket for use in the light string of FIGS. 1-3 ;
- FIG. 9 a is a schematic circuit diagram of a reversible DC power supply for use with the bulbs and modified socket shown in FIG. 9 ;
- FIG. 9 b is an exploded perspective view of dual-filament bulbs and sockets
- FIG. 9 c is a schematic circuit diagram of a power supply permitting simultaneous control of both filaments in the lights strings of FIG. 9 or FIG. 9 b.
- FIG. 9 d is a schematic circuit diagram of a power supply and filament combination illustrating the operation of the dual filament lamps shown in FIG. 9 b.
- FIG. 9 e is a schematic circuit diagram of a dual-power supply and filament combination according to one embodiment of the present invention.
- FIG. 9 f is a schematic circuit diagram of a power supply, rectifier bridge, and filament combination according to another embodiment of the present invention.
- FIG. 10 is an exploded perspective view of another modified bulb and socket for use in the light string of FIGS. 1-3 ;
- FIG. 11 is an exploded view of the bulb and socket shown in FIG. 10 ;
- FIG. 12 is a schematic circuit diagram of a modified power supply for use with the light string of FIGS. 1-3 ;
- FIG. 13 is a perspective view of a power supply housing mounted on a prelit artificial tree for supplying power to multiple light strings on the tree;
- FIG. 14 is a schematic circuit diagram of a modified power supply for use with the light string of FIGS. 1-3 .
- a power supply 10 is connected to a standard residential power outlet that supplies electrical power at a known voltage and frequency.
- the known voltage is 120 volts and the frequency is 60 Hz, whereas in Europe and some other countries the voltage is 220-250 volts and the frequency is 50 Hz.
- the power supply 10 converts the standard power signal to a 24-volt, 30-KHz AC waveform, which may be a pulse amplitude modulated waveform (PAM), which is supplied to a pair of parallel conductors 11 and 12 that supply power to multiple 6-volt incandescent lights L.
- a typical light “string” contains 52 lights L.
- lights L are connected across the two conductors 11 and 12 , with the lights within each group being connected in series with each other, and with the light groups in parallel with each other.
- lights L 1 -L 4 are connected in series to form a first light group G 1 connected across the parallel conductors 11 and 12 .
- Lights L 5 -L 8 are connected in series to form a second group G 2 connected across the conductors 11 and 12 in parallel with the first group G 1 , and so on to the last light group Gn.
- the group of four series-connected lights containing that bulb will be extinguished, but all the other 96 lights in the other groups will remain illuminated because their power-supply circuit is not interrupted by the failed bulb.
- the failed bulb can be easily and quickly located and replaced.
- there is no need for shunts to bypass failed bulbs which is a cost saving in the manufacture of the bulbs. If it is desired to avoid extinguishing all the lights in a series-connected group when one of those lights fails, then the lights may still be provided with shunts that are responsive to the low-voltage output of the power supply.
- each shunt is inoperative unless and until it is subjected to substantially the full output voltage of the power supply, but when the filament associated with a shunt fails, that shunt is subjected to the full output voltage, which renders that shunt operative to bypass the failed filament.
- a variety of different shunt structures and materials are well known in the industry, such as those described in U.S. Pat. Nos. 4,340,841 and 4,808,885.
- each of the individual lights L uses a conventional incandescent bulb 20 attached to a plastic base 21 adapted to be inserted into a plastic socket 22 attached to the wires that supply power to the bulb.
- Each bulb contains a filament 23 that is held in place by a pair of filament leads 25 and 26 extending downwardly through a glass bead 24 and a central aperture in the base 21 .
- the lower ends of the leads 25 , 26 are bent in opposite directions around the lower end of the base 21 and folded against opposite sides of the base to engage mating contacts 27 and 28 in the socket 22 .
- the interior of the socket 22 has a shape complementary to the exterior shape of the lower portion of the bulb base 21 so that the two components fit snugly together.
- the contacts 27 and 28 in each bulb base 22 are formed by tabs attached to stripped end portions of the multiple wire segments that connect the lights L in the desired configuration. If a lamp is at one end of a group, these wire segments may include multiple segments of either the conductor 11 or the conductor 12 from FIGS. 1-3 .
- the connector tabs 27 , 28 in each socket 22 are fed up through a hole in the socket and seated in slots formed in the interior surface of the socket on opposite sides of the hole. Prongs 27 a and 28 a on the sides of the tabs engage the plastic walls of the slots to hold the tabs securely in place within the slots.
- the bent filament leads 25 , 26 on opposite sides of the bulb base 21 are pressed into firm contact with the mating tabs 27 , 28 .
- each series-connected group G is generally connected to two wires, both of which are segments of one of either the conductor 11 or the conductor 12 .
- the other wire, which connects to tab 28 leads to the next light in that particular series-connected group G.
- the wires are twisted or wrapped together as in conventional light sets in which all the lights are connected in series.
- a switching power supply is preferred to minimize size and heat.
- Power supplies of this type generally use switching technology to make the device smaller.
- An alternative is a power supply that uses switching technology and pulse width modulation or frequency modulation for output regulation, although this type of power supply is generally more expensive than those using electronic transformers.
- One suitable electronic transformer is available from ELCO Lighting of Los Angeles, Calif., Cat. No. ETR150, which converts a 120-volt, 60-Hz input into a 12-volt, 30-KHz output.
- FIG. 5 is a generalized schematic diagram of a power supply for converting a standard 120-volt, 60-Hz input at terminals 30 and 31 into a 24-volt AC output at terminals 32 and 33 . It will be understood that devices for supplying low-voltage, high-frequency signals are well known and vary to some degree depending on the output wattage range of the supply, and the particular design of the device is not part of the present invention.
- FIG. 5 illustrates a standard self-oscillating half-bridge circuit in which two transistors Q 1 and Q 2 and parallel diodes D 10 and D 11 form the active side of the bridge, and two capacitors C 1 and C 2 and parallel resistors R 11 and R 12 form the passive side.
- the AC input from terminals 30 and 31 is supplied through a fusing device (in this case fuse F 1 ) to a rectifier circuit, such as diode bridge 34 , consisting of diodes D 1 -D 4 to produce a full-wave rectified output across busses 35 and 36 leading to the capacitors C 1 and C 2 , transistor Q 1 , and transistor Q 2 (through R 13 ).
- the capacitors C 1 , C 2 form a voltage divider, and one end of the primary winding T 1 a of an output transformer T 1 is connected to a point between the two capacitors.
- the secondary winding T 1 b of the output transformer is connected through RT 1 , RT 2 , and S 1 to the output terminals 32 and 33 , which are typically part of a socket for receiving one or more plugs on the ends of light strings.
- the resistors R 11 and R 12 are connected in parallel with the capacitors C 1 and C 2 to equalize the voltages across the two capacitors, and also to provide a current bleed-off path for the capacitors in the event of a malfunction.
- a capacitor C 3 When power is supplied to the circuit, a capacitor C 3 begins charging to the input voltage through a resistor R 2 .
- a diac D 6 and a current-limiting resistor R 1 are connected in series from a point between the capacitor C 3 and the resistor R 2 to the base-drive circuitry of the transistor Q 2 .
- the capacitor C 3 When the capacitor C 3 charges to the trigger voltage of the diac D 6 , the capacitor C 3 discharges, supplying current to the base of the transistor Q 2 and turning on that transistor. This action is required to start the switching process.
- diode D 7 prevents the capacitor C 3 from acquiring sufficient voltage to trigger diac D 6 by repeatedly discharging capacitor C 3 via transistor Q 2 .
- a resistor R 2 limits the current from the bus 35 .
- Resistors R 3 and R 4 connected to the bases of the respective transistors Q 1 and Q 2 stabilize the biases, and diodes D 8 and D 9 in parallel with the respective resistors R 3 and R 4 provide for fast turn
- Self-oscillation of the illustrative circuit is provided by an oscillator transformer T 2 having a saturable core.
- a ferrite core having a B/H curve as square as possible is preferred to provide a reliable saturation point.
- Suitable values for N p and N s are 1 and 3, respectively, and assuming a one-volt supply across the primary winding N p , the forced gain is 3.
- the output transformer T 1 has a non-saturable core with a ratio N p /N s to meet the output requirements, such as 24 volts (RMS). It must also meet the power requirements so that it may operate efficiently and safely.
- the peak voltage V p (pri) across the primary winding T 1 a is one half of the peak rectified voltage V peak at bus 35 .
- the required ratio of turns in the primary and secondary windings of the transformer T 1 is 85/33.9 or 2.5/1.
- a third winding T 1 c with a turns ratio of 10/1 with respect to the primary winding provides a nominal 6-volt output for a bulb checker, described below.
- the illustrative circuit also includes a light dimming feature.
- a switch Si permits the output from the secondary winding T 1 b to be taken across all the turns of that winding or across only a portion of the turns, from a center tap 37 .
- a pair of thermistors RT 1 and RT 2 are provided in the two leads from the secondary winding T 1 b to the terminals 32 and 33 to limit inrush current during startup.
- a transistor Q 3 is connected to ground from a point between a diac D 6 and a diode D 9 .
- the transistor Q 3 is normally off, but is turned on in response to a current level through resistor R 3 that indicates a short circuit.
- the resistor R 13 is connected in series with the emitter-collector circuits of the two transistors Q 1 and Q 2 , and is connected to the base of the transistor Q 3 via resistors R 14 and R 15 , a diode D 12 , and capacitor C 4 .
- the current in the emitter-collector circuit of transistors Q 1 and Q 2 rises rapidly in the event of a short circuit across the output terminals 32 , 33 .
- this current flow through resistor R 13 rises to a level that causes the diode D 12 to conduct, the transistor Q 3 is turned on, thereby disabling the entire power supply circuit.
- the light string is preferably designed so that the load on the power supply remains fixed so that there is no need to include voltage-control circuitry in the power supply to maintain a constant voltage with variable loads.
- the light string preferably does not include a plug or receptacle to permit multiple strings to be connected together in series, end-to-end. Multiple strings may be supplied from a single power supply by simply connecting each string directly to the power supply output via parallel outlet sockets. Extra lengths of wire may be provided between the power supply and the first light group of each string to permit different strings to be located on different portions of a tree. Because ripple is insignificant in decorative lighting applications, circuitry to eliminate or control such fluctuations is not necessary, thereby reducing the size and cost of the power supply.
- the low-voltage output of the power supply may have a voltage level other than 24 volts, but it is preferably no greater than the 42.4 peak voltage specified in the UL standard UL1950, SELV (Safe Extra-Low Voltage).
- SELV Safe Extra-Low Voltage
- 30-volt rms supply for example, 10-volt lights may be used in groups of three, or 6 -volt lights may be used in groups of five.
- Other suitable supply voltages are 6 and 12 volts, although the number of lights should be reduced when these lower output voltages are used.
- the power supply may produce either a DC output or low-voltage AC outputs.
- the frequency of a low-voltage AC output is preferably in the range from about 10 KHz to about 150 KHz within a 60 Hz envelope to permit the use of relatively small and low-cost transformers.
- each light must be kept low to minimize the complexity and cost of the light bulb and its socket.
- Six-volt bulbs are currently in mass production and can be purchased at a low cost per bulb, especially in large numbers. These bulbs are small and simple to install, and the low voltage permits the use of thin wire and inexpensive sockets, as well as minimizing the current in the main conductors.
- the voltage available for each light is 6 volts. Consequently, the bulbs can be the simple and inexpensive bulbs that are mass produced for conventional Christmas light strings using series-connected lights. Similarly, the simple and inexpensive sockets used in such conventional Christmas light strings can also be used.
- Simple crimped electrical contacts may be provided at regular intervals along the lengths of the parallel conductors 11 and 12 for connection to the end sockets in each group of four lights.
- the maximum current level is only about 2 amperes in a 100-light string using four 6-volt lights per group and a 24-volt supply, and thus the two conductors 11 and 12 can also be light, thin, and inexpensive.
- Light strings embodying the present invention are particularly useful when used to pre-string artificial trees, such as Christmas trees. Such trees can contain well over 1000 lights and can cost several hundred dollars (US) at the retail level. When a single light and its shunt fail in a series light string, the lights in an entire section of the tree can be extinguished, causing customer dissatisfaction and often return of the tree for repair or replacement pursuant to a warranty claim. When the artificial tree is made in sections that are assembled by the consumer, only the malfunctioning section need be returned, but the cost to the warrantor is nevertheless substantial. With the light string of the present invention, however, the only lights that are extinguished when a single light fails are the lights in the same series-connected group as the failed light. Since this group includes only a few lights, typically 2 to 5 lights, the failed bulb can be easily located and replaced.
- the use of a single low-voltage power supply for multiple strings is particularly advantageous because it permits several hundred lights to be powered by a single supply. This greatly reduces the cost of the power supply per string, or per light, and permits an entire tree to be illuminated with only a few power supplies, or even a single power supply, depending on the number of lights applied to the tree.
- FIGS. 6-8 illustrate a single power supply 50 for supplying power to a multiplicity of light strings on a prelit artificial tree having a hollow artificial trunk 51 .
- the power supply is contained in a housing 52 having a concave recess 53 in its rear wall 54 to mate with the outer surface of the artificial trunk 51 .
- a pair of apertured mounting tabs 55 and 56 are provided at opposite ends of the rear wall 54 to permit the power supply to be fastened to the trunk 51 with a pair of screws.
- the power input to the supply 50 is provided by a conventional three-conductor cord 57 that enters the housing through the bottom wall 58 .
- the free end of the cord 57 terminates in a standard three-prong plug.
- the power output of the supply 50 is accessible from a terminal strip 59 mounted in a vertically elongated slot in the front wall 60 of the housing 52 .
- This terminal strip 59 can receive a multiplicity of plugs 61 on the ends of a multiplicity of different light strings, as illustrated in FIG. 7 .
- the power supply can accommodate a total of 1000 lights for a given tree.
- Each plug 61 is designed to fit the terminal strip 59 but not standard electrical outlets, to avoid accidental attachment of the low-voltage light string to a 120-volt power source.
- a latch 62 extends along one elongated edge of the terminal strip 59 to engage each plug 61 as it is inserted into the strip, to hold the plugs in place.
- a release tab 63 is pressed to tilt the latch enough to release the plug.
- the front wall of the power supply 50 also includes a bulb-testing socket 64 containing a pair of electrical contacts positioned to make contact with the exposed filament leads on a 6-volt bulb when it is inserted into the socket 64 .
- the contacts in the socket 64 are connected to a 6-volt power source derived from the power-supply circuit within the housing 52 , so that a good bulb will be illuminated when inserted into the socket 64 .
- dimmer, flicker, long-life and other operating modes can be provided by the addition of minor circuitry to the power supply.
- a selector switch 65 is provided on the front of the housing 52 to permit manual selection of such optional modes.
- the front wall 60 of the housing 52 further includes an integrated storage compartment 66 for storage of spare parts such as bulbs, tools and/or fuses.
- This storage compartment 66 can be molded as a single unit that can be simply pressed into place between flanges extending inwardly from the edges of an aperture in the front wall 60 of the housing 52 .
- the flange on the top edge of the aperture engages a slightly flexible latch 67 formed as an integral part of the upper front corner of the storage compartment 66 .
- the lower front corner of the compartment and the adjacent flanges form detents 68 that function as pivot points to allow the storage compartment 66 to be pivoted in and out of the housing 52 , as illustrated in FIG. 7 , exposing the open upper end of the storage compartment.
- the bottom and rear walls 58 and 54 of the housing 52 are preferably provided with respective holes 69 and 70 that allow air to flow by convection through the housing to provide airflow desired of the circuit elements within the housing.
- FIG. 9 illustrates a modified bulb-socket construction for use with a low-voltage DC power supply.
- a DC power supply may be the same device described above with the addition of a full-wave rectifier at the output to convert the low-voltage, high-frequency voltage to a low-voltage, DC voltage.
- the plug on the light string to be connected to the DC power supply is reversible so that the plug may be inserted into the socket of the power supply in either of two orientations, which will cause the DC current to flow through the light string in either of two directions.
- the direction of the current flow determines which of two bulbs in each of the multiple sockets along the length of the string are illuminated.
- the bulbs illuminated by current flow in one direction may be clear bulbs, while the bulbs illuminated by current flow in the opposite direction may be colored and/or flashing bulbs.
- each socket 100 forms receptacles 101 and 102 for two different bulbs 103 and 104 , respectively.
- bulb 103 may be clear and bulb 104 colored.
- Power is delivered to both receptacles 101 and 102 by the same pair of wires 105 and 106 , but the connector tabs 107 and 108 attached to the wires have increased widths to permit either an electrical connection to one of the exposed filament leads on the base of each bulb or to permit the diodes discussed below to be mounted.
- the rear connector tab 108 makes direct contact with one of the filament leads on the base of each bulb.
- the front connector tab 107 carries a pair of inexpensive, oppositely poled, surface-mount diodes 109 and 110 having metallized contact surfaces III and 112 at their upper ends. Each of the metallized contact surfaces 111 and 112 makes contact with a filament lead on only one of the bulb bases, so that each diode 109 and 110 is connected to only one bulb. Because a diode conducts current in only one direction, and the two diodes are poled in opposite directions, the DC current supplied to the socket 100 will flow through only one of the two bulbs 103 or 104 , depending upon the direction of the current flow, which in turn depends upon the orientation of the string plug relative to the power-supply socket.
- the two bulbs 103 and 104 preferably diverge from each other to reduce reflections from the non-illuminated bulb in each pair. If desired, a non-reflective barrier may be provided between the two bulbs.
- a modified construction is to provide only a single pair of diodes for each of the parallel groups of lights.
- the diodes are provided at one end of each parallel group, with two separate wires connecting each diode to one of the two bulbs in each socket in that group.
- Another modified construction uses only a single bulb in each socket, with each bulb having two filaments and two diodes integrated into the base of the bulb for controlling which filament receives power.
- FIG. 9 b shows a typical example of such a construction.
- each bulb 203 , 204 and socket 201 , 202 include a key 213 , 214 and a slot 215 , 216 to insure bulb insertion in only one direction.
- the two filaments are spaced from each other along the axis of the bulb, and one end portion of the bulb is colored so that illumination of the filament within that portion of the bulb produces a colored light, while illumination of the other filament produces a clear light.
- the opposite end portions of the bulb can both be colored, but of two different colors.
- FIG. 9 a is a diagram of a circuit for reversing the polarity of a DC power supply.
- the standard AC power source is connected across a pair of input terminals 120 and 121 and full-wave rectified by a rectifier circuit, such as diode bridge 122 , as described above.
- the rectified output of the bridge 122 is supplied to the light string 123 connected to output terminals 124 and 125 .
- a dual pole switch SW can change the direction of current flow so that the polarity of the terminals 124 and 125 is reversed.
- the dual pole switch SW causes one of the lamps or filaments to light, but not the other. In other words, one of the two lamps in the dual socket of FIG. 9 (or one of the dual filaments of FIG. 9 b ) might be lit at any given time, but not both.
- Another approach is to rectify an AC power source to generate one or more DC sources.
- the DC source (or sources) is then electronically switched at a fast rate, supplying positive current, negative current, and zero current to the light string.
- This approach would also include circuits using SCRs, TRIACs, transistors, or similar devices, triggered asymmetrically on positive and negative half cycles of AC input current.
- FIG. 9 c is an example of the above approach.
- Electronic switches SW 1 and SW 2 can include SCRs, TRIACs, transistors and/or similar devices, as well as other appropriate control circuitry. If terminal T 100 is positive and terminal T 200 is negative, current flows from T 100 to SW 1 . From SW 1 , the current then flows through diode D 300 into filament L 100 a, then to diode D 500 , filament L 200 a, and back to switch SW 2 . Switch SW 2 is turned off at this time, so the current goes through diode D 200 and returns to terminal T 200 . The brightness of filaments L 100 a and L 200 a is controlled by the percentage of time that switch SW 1 remains ‘on’ during this half cycle.
- FIG. 9 d a schematic of a light string in combination with a power source having terminals T 300 and T 400 is shown.
- the current flows through diode D 700 , the top filament F 100 to T 400 , thus only lighting the top filament F 100 .
- the direction of the current is reversed, so that it travels from terminal T 400 to terminal T 300 , the current flows through the bottom filament F 200 , through the diode D 800 and to terminal T 300 .
- the advantage of this design is that the diodes D 700 and D 800 are part of the base of the light string, and not included in the power supply. This allows the light string to operate with fewer wires on the outside, which is more aesthetically pleasing and cheaper to manufacture.
- FIG. 9 e illustrates an embodiment of the present invention where two power sources are used.
- power is supplied by both a DC power supply 500 and an AC power supply 510 .
- the current passes through either diode 720 to the bulb or filament 520 or through diode 710 to the bulb or filament 540 .
- the individual brightness of each bulb can be controlled at will. This is just one example of using multiple power supplies. Other known methods may also be utilized.
- FIG. 9 f illustrates another embodiment of the present invention for manipulating current flow.
- an AC power supply 600 produces a low voltage AC output.
- a center tap 605 is attached to the power supply 600 .
- a full wave rectifier bridge 610 is connected to the AC power supply 600 and generates two DC sources. One is positive and the other negative.
- a single pole triple throw electronic switch 620 switches between the positive DC source, the negative DC source, or no source (position NC) at all. This then controls which of the two bulbs or filaments 630 , 640 , if either, receive any current. By switching at a sufficiently fast rate, and controlling the amount of time switch 620 remains closed in each position, the individual brightness of each bulb ( 630 or 640 ) can be controlled at will.
- FIGS. 10 and 11 illustrate a modified bulb base and socket construction that facilitates the replacement of a failed bulb.
- the bulb 130 in FIGS. 10 and 11 has the same construction described above, including a filament 131 and a pair of filament leads 132 and 133 held in place by a glass bead 134 .
- the leads 132 and 133 extend downwardly through a molded plastic base 135 that fits into a complementary socket 136 .
- the bulb base 135 includes a pair of diametrically opposed lugs 137 and 138 that support a bulb-removal ring 139 between the top surfaces of the lugs and the underside 140 of the flange 141 of the base 135 .
- the central opening 142 of the ring 139 is dimensioned to have a diameter just slightly smaller than that of the flange 141 so that the ring can be forced upwardly over the lugs 137 , 138 until the ring 139 snaps over the top surfaces of the lugs, adjacent the underside of the flange 141 .
- the ring 139 is then captured on the base 135 , but can still rotate relative to the base.
- the ring 139 forms a hinged, apertured tab 143 that can be bent downwardly to fit over a latching element 144 formed on the outer surface of the socket 136 .
- the tab 143 is pulled downwardly and away from the socket 136 to release it from the socket 136 , and then the tab 143 is used to rotate the ring 139 to assist in removing the bulb and its base 135 from the socket 136 .
- a descending ramp 145 molded as an integral part of the ring engages a ramp 146 formed by a complementary notch 147 in the upper end of the socket 136 .
- the ramp 145 on the ring 139 nests in the complementary notch 147 . But when the ring 139 is rotated relative to the socket 136 , the engagement of the two ramps 145 and 146 forces the two parts away from each other, thereby lifting the bulb base 135 out of the socket 136 .
- FIG. 12 is a generalized schematic diagram of a power supply for converting a standard 120-volt, 60-Hz input at terminals 161 , 162 into a 24-volt AC output at terminals 163 , 164 and 165 , 166 .
- This circuit uses a switching power supply to deliver a low-voltage, high-frequency AC signal while also providing the following features for the light strings:
- the AC input from the terminals 161 , 162 is supplied through a fusing device, shown as fuse F 21 , to a diode bridge DB 21 consisting of four diodes to produce a full-wave rectified output across buses 167 and 168 , leading to a pair of capacitors C 23 and C 24 and a corresponding pair of transistors Q 21 and Q 22 forming a half bridge.
- the input to the diode bridge DB 21 includes inductor T 21 , a MOV (metal oxide varistor) or dual zener diode V Z21 and a pair of capacitors C 21 and C 22 which are part of the radio frequency interference and line noise filtering circuitry.
- Capacitors C 25 and C 26 are connected in parallel with capacitors C 23 and C 24 , respectively, to provide increased ripple current rating and high-frequency performance.
- the capacitors C 23 and C 24 may be electrolytic capacitors while capacitors C 25 and C 26 are film-type capacitors offering high-frequency characteristics to the parallel combination.
- a pair of resistors R 30 and R 31 are connected in parallel with the capacitors C 23 and C 24 , respectively, to equalize the voltages across the two capacitors, and also to provide a current bleed-off path for the capacitors in the event of a malfunction.
- the capacitors C 23 , C 24 form a voltage divider, and one end of the primary winding T P of an output transformer T 22 is connected to a point between the two capacitors.
- the secondary windings T S21 and T S22 of the transformer T 22 are connected to the output terminals 163 , 164 and 165 , 166 , which are typically part of a socket for receiving one or more plugs on the ends of light strings.
- a capacitor C 27 is connected in parallel with the primary winding T P and acts as a snubber across the transformer T 22 to reduce voltage ringing.
- An integrated circuit driver IC 21 drives the half bridge MOSFET transistors Q 21 and Q 22 .
- the power supply for the driver IC 21 is derived from the DC bus through a resistor R 25 and a parallel combination of capacitors C 28 and C 29 .
- the capacitor C 28 may be an electrolytic or an a film capacitor, and the capacitor C 29 is preferably a film-type capacitor offering a high-frequency de-coupling characteristic to the driver IC 21 .
- a zener diode V Z22 clamps the voltage at V CC input pin 1 of IC 21 to ensure a safe operating limit.
- the zener diode V Z22 along with the resistor R 25 provide a regulated power supply for the driver IC 21 .
- a diode D 22 and a capacitor C 31 provide a boot-strap mechanism for power storage to turn on the MOSFET Q 21 of the half bridge.
- the frequency of oscillation of the MOSFET driver is determined by the total resistance connected across pins 2 and 3 of the driver IC 21 together with the capacitance from pin 3 to ground.
- the two outputs of IC 21 , pins 7 and 5 are connected to the gates of the MOSFETs Q 21 and Q 22 .
- a resistor R 21 limits the gate current of the MOSFET Q 21
- R 24 limits the gate current of MOSFET Q 22 .
- a pair of resistors R 22 and R 23 are connected across the MOSFETs Q 21 and Q 22 to reduce noise sensitivity to avoid any spurious turn-on of the MOSFETs.
- Resistor/capacitor combinations R 27 /C 32 and R 28 /C 33 are tied across the two MOSFETs Q 21 and Q 22 as snubbers to quench transient voltage surges at the turn-off of these transistors.
- the voltage developed on the bus 167 causes voltage to be applied to the IC 21 's V CC input. This causes the driver IC 21 to start oscillating and start driving the half-bridge transistors Q 21 and Q 22 alternately. This applies voltage across the primary winding T P of the transformer T 22 , which in turn applies voltage across the secondary windings T S21 and T S22 of the transformer, which is applied to the load.
- the rectified output of the DC bus 167 is applied is applied to the Vcc pin 1 of the driver IC 21 through a resistor R 25 .
- a zener diode V Z22 and capacitors C 28 and C 29 connected between the Vcc pin 1 and ground, provide decoupling and voltage regulation for the driver IC 21 .
- the two outputs of IC 21 at pins 7 and 5 provide drive to the gates of the MOSFETs Q 21 and Q 22 .
- the RMS output voltage can be varied by controlling the on/off ratio of the pulse width applied to the primary of the transformer T 22 .
- a limited dimming control can be achieved by varying the frequency of the oscillation signal from the integrated circuit IC 21 .
- the output voltage is controlled by the potentiometer P 21 connected to the integrated circuit, which permits the user to adjust the light output to the desired level.
- the dimming feature can be used to provide different fixed light levels, such as a low light output, an energy-saving output, or a full-light output. These three light levels can be achieved by use of three fixed resistors in place of the potentiometer P 21 .
- the three resistor settings can be selected by use of a three-position switch.
- a low-light output corresponds to a minimum output voltage
- a full-light output corresponds to maximum output voltage.
- An energy-saving output corresponds to an intermediate light level such as a 75% light output.
- the bulb life can be extended by soft starting the driver IC 21 , so that the IC starts with minimum light output and slowly ramps up to the full or desired light level.
- the bulbs in the light string are normally cold, and the cold resistance of the bulbs is very low.
- the cold resistance of a bulb is typically ten times lower than the steady state, full-light operating resistance. If the full voltage were applied to a cold bulb at startup, the inrush bulb current could be ten times the rated current of the bulb, which could cause the bulb filament to weaken and ultimately break.
- soft starting the control circuit the voltage applied during starting of the bulb is significantly lower. As the bulb heats up and the bulb resistance increases, the voltage is increased. Thus the bulb current never exceeds its hot rating, which increases bulb life.
- Soft starting of the circuit also helps reduce the inrush current from the circuit, thereby avoiding any interaction with other circuits or appliances.
- Soft starting in this circuit can be achieved by starting the driver IC 21 at a high frequency and then reducing it to the normal operating frequency after a short delay, e.g. one second. This is possible because it is characteristic of this supply that higher switching frequencies tend to reduce supply output, causing the lamps to dim.
- a typical method for achieving soft starting is shown in FIG. 12 .
- Vcc voltage is applied to pin 1 (Vcc) of IC 21 , enabling it to operate.
- Voltage is also applied to resistor R 93 . This causes capacitor C 96 to begin to charge up. During this time, transistor Q 90 is ‘off’.
- the switching frequency of the supply is determined by the resistance between pins 2 and 3 of IC 21 in combination with the capacitance from pin 3 to ground. Since the transistor Q 90 is ‘off’, that capacitance is capacitor C 30 in series with capacitor C 95 , which causes the supply to switch at a very high frequency and its output to be correspondingly low. The lights attached glow dimly. After about one second capacitor C 96 charges up, causing transistor Q 90 to turn on. Transistor Q 90 and diode D 95 now effectively short out capacitor C 95 so that only capacitor C 30 is left in the circuit. This causes the power supply to switch at a lower frequency, insuring normal lamp brightness. It should be understood that this is only one of many known methods of achieving the soft-start function.
- the driver IC 21 can be replaced by another integrated circuit, such as an IR21571, to drive the FETs, it is capable of providing pulse width modulation.
- the output can be controlled from low light to full light.
- FIG. 12 is a half bridge circuit and a typical example, but it will be understood that the features of this circuit can be incorporated in other topologies such as flyback, forward, buck, full bridge or other power converters, including isolated as well as non-isolated power converter designs.
- FIG. 13 illustrates a mounting arrangement for a housing 170 containing any of the power supplies described above, on a pre-lit artificial tree having a central “trunk” pole 171 and multiple branches such as branches 172 - 174 extending laterally from a support collar 175 on the pole 171 .
- Each branch carries a portion of one of multiple light strings attached to connectors on the housing 170 .
- two such connectors 176 and 177 project upwardly from the top of the housing 170 for receiving mating connectors 178 and 179 attached to respective ends of two pairs of conductors 180 and 181 .
- the conductors are connected to the power supply contained within the housing 170 .
- the power supply housing 170 is preferably mounted on the uppermost collar 175 in the lowest of the three sections. Then one of the two connectors 176 , 177 can supply power to the lowest section(s) of the tree, which generally is(are) the largest section(s), while the other connector supplies power to the smaller, upper sections of the tree.
- the electrical loads in the light strings in these two portions of the tree are typically about equal, and thus the output of the power supply can be split evenly between the two output connectors 176 , 177 .
- the outer end panel 182 of the housing 170 is most accessible to the user.
- This end panel 182 carries a manually operated on-off switch 183 for turning the power supply on and off, and an indicator light 184 that is illuminated whenever the power supply is connected to a power source.
- a dimmer knob 185 connected to a potentiometer permits the user to control the light level by adjusting the position of the potentiometer.
- a bulb socket 186 permits the user to test a bulb by connecting the bulb to an appropriate power source within the housing.
- the panel 182 also contains a drawer 187 for storage of spare bulbs and fuses. Power for the circuitry within the housing 170 is supplied via cord 188 .
- a hook 189 extends upwardly from the housing.
- the weight of the housing 170 forces the lower end of the inside panel 190 against the pole 171 , and a yoke 191 projecting from the inside panel keeps the housing centered on the pole.
- the two pairs of conductors 180 and 181 are connected to respective connector blocks 192 and 193 each of which includes multiple connectors for receiving mating connectors crimped onto the ends of the wires of multiple light strings.
- the connector block 193 typically receives the connectors on a multiplicity of light strings mounted on the bottom section(s) of a pre-lit tree.
- the other connector block 192 typically receives a multiplicity of light strings for the middle section of the tree.
- the top section(s) of the tree typically includes two or more light strings, which are connected to a smaller third connector block 196 connected to the block 192 via mating connectors 194 and 195 on the ends of two pairs of conductors leading to the respective blocks 192 and 196 .
- FIG. 14 is another schematic diagram of a power supply for converting a standard 120-volt, 60-Hz input at terminals 261 , 262 into a 24 -volt AC output at terminals 263 , 264 and 265 , 266 .
- This circuit uses a switching power supply to deliver a low-voltage, high-frequency PAM signal while also providing the following features for the light strings:
- the AC input from the terminals 261 , 262 is supplied through a fuse FH 201 to a diode bridge DB 221 consisting of four diodes to produce a full-wave rectified output across buses 267 and 268 , leading to a pair of capacitors C 223 and C 224 and a corresponding pair of transistors Q 221 and Q 222 forming a half bridge.
- the input to the diode bridge DB 221 includes a passive component network consisting of C 203 , C 204 , C 206 , C 207 , L 201 , L 204 and RV 201 which are part of the radio frequency interference and line noise filtering circuitry.
- Capacitors C 225 and C 226 are connected in parallel with capacitors C 223 and C 224 , respectively, to provide increased ripple current rating and high-frequency performance.
- the capacitors C 223 and C 224 may be electrolytic capacitors while capacitors C 225 and C 226 are film-type capacitors offering high-frequency characteristics to the parallel combination.
- the capacitors C 223 , C 224 form a virtual center tap.
- One end of the primary winding T P of an output transformer T 222 is connected to a point between the two capacitors.
- the secondary winding T S of the transformer T 222 is connected to the output terminals 263 , 264 and 265 , 266 , through series inductors L 202 and L 203 (along with C 214 , C 215 , C 216 and R 216 ) which act as filters to minimize electromagnetic interference.
- the output terminals receive one or more plugs on the ends of light strings.
- An integrated circuit driver U 201 such as a IR21571D controller available from International Rectifier, controls the switching frequency of oscillation and other features indicated above.
- the power supply V cc for the driver U 201 is derived from the DC bus 267 through resistors R 201 and R 202 to an internal zener diode.
- the device includes protection elements which prohibit starting oscillation (operation) until the power supply voltages are in tolerance or if there is a fault which interferes with the proper sequencing of voltages V DC , V CC , and V SD .
- Diodes D 202 , D 203 , D 204 and capacitors C 209 , C 210 and C 211 provide a boot-strap mechanism for powering the IC.
- Capacitors C 212 and C 218 provide bulk storage to start the controller at power up.
- the frequency of oscillation of the controller is determined by the total resistance connected between pin 12 (Corn) and pin 4 of the controller U 201 and a capacitor C 213 connected between pin 6 and pin 12 (Corn) of the controller U 201 .
- the two outputs of U 201 at pins 11 and 16 are connected to the gates of the MOSFETs Q 221 and Q 222 .
- a resistor R 208 limits the gate current of the MOSFET Q 221 .
- a second resistor R 215 limits the gate current of the MOSFET Q 222 .
- the voltage developed on the bus 267 causes voltage to be applied to U 201 V CC , V DC , and SD.
- U 201 to start oscillating and start driving the half-bridge transistors Q 221 and Q 222 alternately.
- This applies voltage across the primary winding T P of the transformer T 222 , which in turn applies voltage across the secondary winding T S of the transformer, which is applied to the load.
- the rectified output of the DC bus 267 is applied to the Vcc and V DC pins of the controller U 201 through resistors R 201 and R 202 .
- An internal zener diode and capacitors C 218 and C 212 maintain the operating voltages for the controller.
- a voltage divider consisting of a thermistor TH 201 and R 205 sets the voltage at pin 9 (SD) of U 201 . The controller uses these three voltages to determine the state of the power bus 267 to prevent operation when the power bus has collapsed.
- the preset output voltage is set by the turns ratio of the output transformer T 222 .
- a limited dimming control is achieved by adjusting the resistance that appears between pins 6 and 7 of controller U 201 . This resistance controls the amount of dead time for the output FETs, which reduces the RMS value of the output voltage of T 222 and thereby reduces the intensity of the light strings connected to terminals 263 , 264 and 265 , 266
- the dimming feature can be used to provide different fixed light levels, such as a low light output, an energy-saving output, or a full-light output. These three light levels can be achieved by use of three fixed resistors in place of the potentiometer R 214 .
- the three resistor settings can be selected by use of a three-position switch.
- a low-light output corresponds to a maximum output dead time
- a full-light output corresponds to minimum dead time.
- An energy-saving output corresponds to an intermediate light level such as a 75% light output.
- the controller has an additional control pin (SD) which can be used as a thermal shutdown control to protect the power supply from overheating.
- SD additional control pin
- FIG. 14 employs a half bridge circuit, but it will be understood that the features of this circuit can be incorporated in other topologies such as flyback, forward, buck, full bridge or other power converters, including isolated as well as non-isolated power converter designs.
Abstract
A string of decorative lights. The string of decorative lights includes a power supply that has an input adapted for connection to a standard residential electrical power outlet. The power supply includes circuitry for converting the standard residential voltage to a low-voltage output. The input is connected through a fusing device to a rectifier circuit. The string of decorative lights also includes a pair of conductors connected to the output of the power supply for supplying the low-voltage output to multiple decorative lights. Multiple lights are also connected to the conductors along the lengths thereof. Each of the lights, or groups of the lights, are connected in parallel across the conductors.
Description
- This application is a continuation in part of PCT application PCT/US/02/07609 filed Mar. 13, 2002, claiming priority to U.S.
provisional applications 60/277,346 filed Mar. 19, 2001, 60/277,481 filed Mar. 20, 2001, 60/287,162 filed Apr. 27, 2001, 60/289,865 filed May 9, 2001, and U.S. applications Ser. No, 09/854,255 filed May 14, 2001, 10/041,032 filed Dec. 28, 2001 and Ser. No. 10/068,452 filed Feb. 2, 2002. - The present invention relates to decorative lights, including lights for Christmas trees, including pre-strung or “pre-lit” artificial trees.
- In accordance with one embodiment of the present invention, one or more strings of decorative lights are supplied with power by converting a standard residential electrical voltage to a low-voltage, and supplying the low-voltage to at least one pair of parallel conductors having multiple decorative lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors. A string of decorative lights embodying this invention comprises a power supply having an input adapted for connection to a standard residential electrical power outlet, the power supply including circuitry for converting the standard residential voltage to a low-voltage e.g. 12 volts to 30 volts output; a pair of conductors connected to the output of the power supply for supplying the low-voltage output to multiple decorative lights; and multiple lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors. The lights preferably require voltages of about 6 volts or less, and are preferably connected in parallel groups of 2 to 5 lights per group with the lights within each group being connected in series with each other.
- In one particular embodiment, a supply providing low-voltage DC is used in combination with a string having dual-bulb sockets and associated diode pairs to permit different decorative lighting effects to be achieved by simply reversing the direction of current flow in the string, by changing the orientation of the string plug relative to the power supply.
- In another embodiment of the present invention, one or more strings of decorative lights are supplied with power by a power supply including either circuitry for converting the standard residential voltage to one or more DC voltages and circuitry for switching the polarity and/or amplitude of the DC voltage(s), or circuitry for allowing only a predetermined portion of every AC cycle of an AC voltage source to reach the multiple lights.
- In another embodiment of the present invention, a string of decorative lights includes a plurality of elongated electrical conductors having multiple electrical lamps inserted into sockets. The multiple electrical lamps and sockets are connected at intervals along the lengths of the conductors. A small compartment is also included and includes a wall forming a first opening adapted to receive in frictional engagement a base of an electrical lamp. The compartment also includes a first member designed to engage a second member on the socket to assist in removing the electrical lamp from the socket.
- The invention may best be understood by reference to the following description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a schematic diagram of a string of decorative lights embodying the present invention; -
FIG. 2 is a more detailed diagram of the light string shown inFIG. 1 ; -
FIG. 3 is an enlarged and more detailed perspective view of a portion of the light string ofFIG. 2 ; -
FIG. 4 is an exploded perspective view of a bulb and socket for use in the light string ofFIGS. 1-3 ; -
FIG. 5 is a schematic circuit diagram of a suitable power supply for use in the light string ofFIGS. 1-3 ; -
FIG. 6 is a front elevation of a power supply for supplying multiple light strings on a prelit artificial tree; -
FIG. 7 is a side elevation of the power supply ofFIG. 6 ; -
FIG. 8 is a top plan view of the power supply ofFIG. 6 ; -
FIG. 9 is an exploded perspective view of bulbs and a modified socket for use in the light string ofFIGS. 1-3 ; -
FIG. 9 a is a schematic circuit diagram of a reversible DC power supply for use with the bulbs and modified socket shown inFIG. 9 ; -
FIG. 9 b is an exploded perspective view of dual-filament bulbs and sockets; -
FIG. 9 c is a schematic circuit diagram of a power supply permitting simultaneous control of both filaments in the lights strings ofFIG. 9 orFIG. 9 b. -
FIG. 9 d is a schematic circuit diagram of a power supply and filament combination illustrating the operation of the dual filament lamps shown inFIG. 9 b. -
FIG. 9 e is a schematic circuit diagram of a dual-power supply and filament combination according to one embodiment of the present invention; -
FIG. 9 f is a schematic circuit diagram of a power supply, rectifier bridge, and filament combination according to another embodiment of the present invention; -
FIG. 10 is an exploded perspective view of another modified bulb and socket for use in the light string ofFIGS. 1-3 ; -
FIG. 11 is an exploded view of the bulb and socket shown inFIG. 10 ; -
FIG. 12 is a schematic circuit diagram of a modified power supply for use with the light string ofFIGS. 1-3 ; -
FIG. 13 is a perspective view of a power supply housing mounted on a prelit artificial tree for supplying power to multiple light strings on the tree; and -
FIG. 14 is a schematic circuit diagram of a modified power supply for use with the light string ofFIGS. 1-3 . - Although the invention will be described next in connection with certain preferred embodiments, it will be understood that the invention is not limited to those particular embodiments. On the contrary, the description of the invention is intended to cover all alternatives, modifications, and equivalent arrangements as may be included within the spirit and scope of the invention as defined by the appended claims.
- Turning now to the drawings and referring first to
FIGS. 1-3 , apower supply 10 is connected to a standard residential power outlet that supplies electrical power at a known voltage and frequency. In the United States, the known voltage is 120 volts and the frequency is 60 Hz, whereas in Europe and some other countries the voltage is 220-250 volts and the frequency is 50 Hz. Thepower supply 10 converts the standard power signal to a 24-volt, 30-KHz AC waveform, which may be a pulse amplitude modulated waveform (PAM), which is supplied to a pair ofparallel conductors - Multiple groups of the lights L are connected across the two
conductors parallel conductors conductors - If one of the bulbs fails, the group of four series-connected lights containing that bulb will be extinguished, but all the other 96 lights in the other groups will remain illuminated because their power-supply circuit is not interrupted by the failed bulb. Thus, the failed bulb can be easily and quickly located and replaced. Moreover, there is no need for shunts to bypass failed bulbs, which is a cost saving in the manufacture of the bulbs. If it is desired to avoid extinguishing all the lights in a series-connected group when one of those lights fails, then the lights may still be provided with shunts that are responsive to the low-voltage output of the power supply. That is, each shunt is inoperative unless and until it is subjected to substantially the full output voltage of the power supply, but when the filament associated with a shunt fails, that shunt is subjected to the full output voltage, which renders that shunt operative to bypass the failed filament. A variety of different shunt structures and materials are well known in the industry, such as those described in U.S. Pat. Nos. 4,340,841 and 4,808,885.
- As shown in
FIG. 4 , each of the individual lights L uses a conventionalincandescent bulb 20 attached to aplastic base 21 adapted to be inserted into aplastic socket 22 attached to the wires that supply power to the bulb. Each bulb contains afilament 23 that is held in place by a pair of filament leads 25 and 26 extending downwardly through aglass bead 24 and a central aperture in thebase 21. The lower ends of theleads base 21 and folded against opposite sides of the base to engagemating contacts socket 22. The interior of thesocket 22 has a shape complementary to the exterior shape of the lower portion of thebulb base 21 so that the two components fit snugly together. - As shown most clearly in
FIG. 4 , thecontacts bulb base 22 are formed by tabs attached to stripped end portions of the multiple wire segments that connect the lights L in the desired configuration. If a lamp is at one end of a group, these wire segments may include multiple segments of either theconductor 11 or theconductor 12 fromFIGS. 1-3 . As can be seen inFIG. 4 , theconnector tabs socket 22 are fed up through a hole in the socket and seated in slots formed in the interior surface of the socket on opposite sides of the hole. Prongs 27a and 28a on the sides of the tabs engage the plastic walls of the slots to hold the tabs securely in place within the slots. When thebulb base 21 is inserted into itssocket 22, the bent filament leads 25, 26 on opposite sides of thebulb base 21 are pressed into firm contact with themating tabs - As can be most clearly seen at the lower right-hand corner of
FIG. 4 , thetab 27 at each end of each series-connected group G is generally connected to two wires, both of which are segments of one of either theconductor 11 or theconductor 12. The other wire, which connects totab 28, leads to the next light in that particular series-connected group G. - After all the connections have been made, the wires are twisted or wrapped together as in conventional light sets in which all the lights are connected in series.
- Turning next to the power supply 10 (shown in
FIG. 1 ), a switching power supply is preferred to minimize size and heat. Power supplies of this type generally use switching technology to make the device smaller. An alternative is a power supply that uses switching technology and pulse width modulation or frequency modulation for output regulation, although this type of power supply is generally more expensive than those using electronic transformers. One suitable electronic transformer is available from ELCO Lighting of Los Angeles, Calif., Cat. No. ETR150, which converts a 120-volt, 60-Hz input into a 12-volt, 30-KHz output. -
FIG. 5 is a generalized schematic diagram of a power supply for converting a standard 120-volt, 60-Hz input atterminals terminals FIG. 5 illustrates a standard self-oscillating half-bridge circuit in which two transistors Q1 and Q2 and parallel diodes D10 and D11 form the active side of the bridge, and two capacitors C1 and C2 and parallel resistors R11 and R12 form the passive side. - The AC input from
terminals diode bridge 34, consisting of diodes D1-D4 to produce a full-wave rectified output acrossbusses output terminals - When power is supplied to the circuit, a capacitor C3 begins charging to the input voltage through a resistor R2. A diac D6 and a current-limiting resistor R1 are connected in series from a point between the capacitor C3 and the resistor R2 to the base-drive circuitry of the transistor Q2. When the capacitor C3 charges to the trigger voltage of the diac D6, the capacitor C3 discharges, supplying current to the base of the transistor Q2 and turning on that transistor. This action is required to start the switching process. During normal operation, diode D7 prevents the capacitor C3 from acquiring sufficient voltage to trigger diac D6 by repeatedly discharging capacitor C3 via transistor Q2. A resistor R2 limits the current from the
bus 35. Resistors R3 and R4, connected to the bases of the respective transistors Q1 and Q2 stabilize the biases, and diodes D8 and D9 in parallel with the respective resistors R3 and R4 provide for fast turn off. - Self-oscillation of the illustrative circuit is provided by an oscillator transformer T2 having a saturable core. A ferrite core having a B/H curve as square as possible is preferred to provide a reliable saturation point. The number of turns in the primary and secondary windings T2 b and T2 a of the transformer T2 are selected to force the operating gain of the transistors Q1 and Q2, based on the following equation:
Np*IP=Ns*Is
where Np is the number of turns in the primary winding T2 b, Ns is the number of turns in the secondary winding T2 a, Ip is the peak collector current, and Is is the base current. Suitable values for Np and Ns are 1 and 3, respectively, and assuming a one-volt supply across the primary winding Np, the forced gain is 3. The nominal collector current Ic is:
I c=(P out/η)*(2NV line)
where Ic and Vline are RMS values, η is the efficiency of the output transformer T1, and Pout is the average output power. - The saturable transformer T2 determines the oscillation frequency F according to the following equation:
F=(V p*104)/(4*Bs * A*N p)
where F is the chopper frequency, Vp is the voltage across the primary winding T2 b of the oscillator transformer T2 in volts, Bs is the core saturation flux in Tesla, and A is the core cross section in cm2. - The output transformer T1 has a non-saturable core with a ratio Np/Ns to meet the output requirements, such as 24 volts (RMS). It must also meet the power requirements so that it may operate efficiently and safely. The peak voltage Vp(pri) across the primary winding T1 a is one half of the peak rectified voltage Vpeak at
bus 35.
V p(pri)=V peak/2=(120*1.414)/2=85 volts - The desired 24-volt output translates to:
V p(sec)=24*1.414=33.9 volts - Thus, the required ratio of turns in the primary and secondary windings of the transformer T1 is 85/33.9 or 2.5/1.
- A third winding T1 c with a turns ratio of 10/1 with respect to the primary winding provides a nominal 6-volt output for a bulb checker, described below.
- The illustrative circuit also includes a light dimming feature. Thus, a switch Si permits the output from the secondary winding T1 b to be taken across all the turns of that winding or across only a portion of the turns, from a
center tap 37. A pair of thermistors RT1 and RT2 are provided in the two leads from the secondary winding T1 b to theterminals - To automatically shut down the circuit in the event of a short circuit across the
output terminals output terminals - The light string is preferably designed so that the load on the power supply remains fixed so that there is no need to include voltage-control circuitry in the power supply to maintain a constant voltage with variable loads. For example, the light string preferably does not include a plug or receptacle to permit multiple strings to be connected together in series, end-to-end. Multiple strings may be supplied from a single power supply by simply connecting each string directly to the power supply output via parallel outlet sockets. Extra lengths of wire may be provided between the power supply and the first light group of each string to permit different strings to be located on different portions of a tree. Because ripple is insignificant in decorative lighting applications, circuitry to eliminate or control such fluctuations is not necessary, thereby reducing the size and cost of the power supply.
- The low-voltage output of the power supply may have a voltage level other than 24 volts, but it is preferably no greater than the 42.4 peak voltage specified in the UL standard UL1950, SELV (Safe Extra-Low Voltage). With a 30-volt rms supply, for example, 10-volt lights may be used in groups of three, or 6-volt lights may be used in groups of five. Other suitable supply voltages are 6 and 12 volts, although the number of lights should be reduced when these lower output voltages are used.
- The power supply may produce either a DC output or low-voltage AC outputs. The frequency of a low-voltage AC output is preferably in the range from about 10 KHz to about 150 KHz within a 60 Hz envelope to permit the use of relatively small and low-cost transformers.
- The voltage across each light must be kept low to minimize the complexity and cost of the light bulb and its socket. Six-volt bulbs are currently in mass production and can be purchased at a low cost per bulb, especially in large numbers. These bulbs are small and simple to install, and the low voltage permits the use of thin wire and inexpensive sockets, as well as minimizing the current in the main conductors. In the illustrative light string of
FIG. 1 with a 24-volt supply and four lights per group, the voltage available for each light is 6 volts. Consequently, the bulbs can be the simple and inexpensive bulbs that are mass produced for conventional Christmas light strings using series-connected lights. Similarly, the simple and inexpensive sockets used in such conventional Christmas light strings can also be used. Simple crimped electrical contacts may be provided at regular intervals along the lengths of theparallel conductors conductors - Light strings embodying the present invention are particularly useful when used to pre-string artificial trees, such as Christmas trees. Such trees can contain well over 1000 lights and can cost several hundred dollars (US) at the retail level. When a single light and its shunt fail in a series light string, the lights in an entire section of the tree can be extinguished, causing customer dissatisfaction and often return of the tree for repair or replacement pursuant to a warranty claim. When the artificial tree is made in sections that are assembled by the consumer, only the malfunctioning section need be returned, but the cost to the warrantor is nevertheless substantial. With the light string of the present invention, however, the only lights that are extinguished when a single light fails are the lights in the same series-connected group as the failed light. Since this group includes only a few lights, typically 2 to 5 lights, the failed bulb can be easily located and replaced.
- When pre-stringing artificial trees, the use of a single low-voltage power supply for multiple strings is particularly advantageous because it permits several hundred lights to be powered by a single supply. This greatly reduces the cost of the power supply per string, or per light, and permits an entire tree to be illuminated with only a few power supplies, or even a single power supply, depending on the number of lights applied to the tree.
-
FIGS. 6-8 illustrate asingle power supply 50 for supplying power to a multiplicity of light strings on a prelit artificial tree having a hollowartificial trunk 51. The power supply is contained in ahousing 52 having aconcave recess 53 in itsrear wall 54 to mate with the outer surface of theartificial trunk 51. A pair of apertured mountingtabs rear wall 54 to permit the power supply to be fastened to thetrunk 51 with a pair of screws. The power input to thesupply 50 is provided by a conventional three-conductor cord 57 that enters the housing through thebottom wall 58. The free end of thecord 57 terminates in a standard three-prong plug. - The power output of the
supply 50 is accessible from aterminal strip 59 mounted in a vertically elongated slot in thefront wall 60 of thehousing 52. Thisterminal strip 59 can receive a multiplicity ofplugs 61 on the ends of a multiplicity of different light strings, as illustrated inFIG. 7 . Thus, if each light string contains 100 lights and the terminal strip can receive ten plugs, the power supply can accommodate a total of 1000 lights for a given tree. Eachplug 61 is designed to fit theterminal strip 59 but not standard electrical outlets, to avoid accidental attachment of the low-voltage light string to a 120-volt power source. A latch 62 extends along one elongated edge of theterminal strip 59 to engage eachplug 61 as it is inserted into the strip, to hold the plugs in place. When it is desired to remove one of theplugs 61, arelease tab 63 is pressed to tilt the latch enough to release the plug. - The front wall of the
power supply 50 also includes a bulb-testing socket 64 containing a pair of electrical contacts positioned to make contact with the exposed filament leads on a 6-volt bulb when it is inserted into thesocket 64. The contacts in thesocket 64 are connected to a 6-volt power source derived from the power-supply circuit within thehousing 52, so that a good bulb will be illuminated when inserted into thesocket 64. - If desired, dimmer, flicker, long-life and other operating modes can be provided by the addition of minor circuitry to the power supply. In the
illustrative power supply 50, aselector switch 65 is provided on the front of thehousing 52 to permit manual selection of such optional modes. - The
front wall 60 of thehousing 52 further includes anintegrated storage compartment 66 for storage of spare parts such as bulbs, tools and/or fuses. Thisstorage compartment 66 can be molded as a single unit that can be simply pressed into place between flanges extending inwardly from the edges of an aperture in thefront wall 60 of thehousing 52. The flange on the top edge of the aperture engages a slightlyflexible latch 67 formed as an integral part of the upper front corner of thestorage compartment 66. The lower front corner of the compartment and the adjacent flanges formdetents 68 that function as pivot points to allow thestorage compartment 66 to be pivoted in and out of thehousing 52, as illustrated inFIG. 7 , exposing the open upper end of the storage compartment. - As can be seen in
FIGS. 7 and 8 , the bottom andrear walls housing 52 are preferably provided withrespective holes -
FIG. 9 illustrates a modified bulb-socket construction for use with a low-voltage DC power supply. A DC power supply may be the same device described above with the addition of a full-wave rectifier at the output to convert the low-voltage, high-frequency voltage to a low-voltage, DC voltage. The plug on the light string to be connected to the DC power supply is reversible so that the plug may be inserted into the socket of the power supply in either of two orientations, which will cause the DC current to flow through the light string in either of two directions. As will be described in more detail below, the direction of the current flow determines which of two bulbs in each of the multiple sockets along the length of the string are illuminated. This permits different decorative effects to be achieved with the same string by simply reversing the orientation of the string plug relative to the power-supply socket. For example, the bulbs illuminated by current flow in one direction may be clear bulbs, while the bulbs illuminated by current flow in the opposite direction may be colored and/or flashing bulbs. - As can be seen in
FIG. 9 , each socket 100forms receptacles different bulbs bulb 103 may be clear andbulb 104 colored. Power is delivered to bothreceptacles wires connector tabs rear connector tab 108 makes direct contact with one of the filament leads on the base of each bulb. Thefront connector tab 107 carries a pair of inexpensive, oppositely poled, surface-mount diodes diode bulbs - As shown in
FIG. 9 , the twobulbs - A modified construction is to provide only a single pair of diodes for each of the parallel groups of lights. The diodes are provided at one end of each parallel group, with two separate wires connecting each diode to one of the two bulbs in each socket in that group. Another modified construction uses only a single bulb in each socket, with each bulb having two filaments and two diodes integrated into the base of the bulb for controlling which filament receives power.
FIG. 9 b shows a typical example of such a construction. As shown inFIG. 9 b, eachbulb 203, 204 andsocket slot -
FIG. 9 a is a diagram of a circuit for reversing the polarity of a DC power supply. The standard AC power source is connected across a pair ofinput terminals diode bridge 122, as described above. The rectified output of thebridge 122 is supplied to the light string 123 connected tooutput terminals bridge 122 and theterminals terminals - In some cases, light strings using the bulb and socket configurations of
FIGS. 9 and 9 b would make use of the power supply described inFIG. 9 a. The dual pole switch SW causes one of the lamps or filaments to light, but not the other. In other words, one of the two lamps in the dual socket ofFIG. 9 (or one of the dual filaments ofFIG. 9 b) might be lit at any given time, but not both. - Other known power supplies may be used such that power is supplied to both lamps (or filaments), causing both lamps or filaments to be lit simultaneously. These circuits all take advantage of the thermal time lag in the filaments of the lamps. One method drives the light string with an AC current. This causes both of the lamps or filaments to glow with equal intensity. A second DC current (or lower frequency AC current) is added to the original AC current. The combined AC and DC currents cause one lamp or filament to glow brighter, while the second becomes dimmer. By adjusting the amplitudes of the AC and DC currents, independent control can be obtained over each lamp in
FIG. 9 (or filament inFIG. 9 b). If the second source were a slowly varying AC source instead of DC, the lamps could be made to fade from one into another and back at the frequency of that source. - Another approach is to rectify an AC power source to generate one or more DC sources. The DC source (or sources) is then electronically switched at a fast rate, supplying positive current, negative current, and zero current to the light string. By controlling the length of time a switch is ‘on’ or ‘off,’ independent control can be obtained over the bulbs or filaments. This approach would also include circuits using SCRs, TRIACs, transistors, or similar devices, triggered asymmetrically on positive and negative half cycles of AC input current.
-
FIG. 9 c is an example of the above approach. Electronic switches SW1 and SW2 can include SCRs, TRIACs, transistors and/or similar devices, as well as other appropriate control circuitry. If terminal T100 is positive and terminal T200 is negative, current flows from T100 to SW1. From SW1, the current then flows through diode D300 into filament L100 a, then to diode D500, filament L200 a, and back to switch SW2. Switch SW2 is turned off at this time, so the current goes through diode D200 and returns to terminal T200. The brightness of filaments L100 a and L200 a is controlled by the percentage of time that switch SW1 remains ‘on’ during this half cycle. When terminal T200 becomes positive and terminal T100 is negative, the current flows from terminal T200 to switch SW2, to filament L200 b, to diode D600, to filament L100 b, to diodes D400 and D100, and then back to terminal T100. Switch SW1 is off at this time, and switch SW2 controls the brightness of filaments L100 b and L200 b. Switching occurs at such a high rate that the filaments L100 a, L100 b, L200 a, and L200 b, do not have time to cool. Thus, both lamps glow. Relative brightness between the lamps and overall brightness are thus controlled by the amount of time switches SW1 and SW2 are ‘on’ during their respective half cycles. - These methods are described for illustrative purposes only. There are numerous other well-known methods that can be used. These methods are beneficial effects. For example, if one lamp or filament were colored red and the other were white, it would be possible to cause the lamps to fade from white to red every 10 seconds or so. By fading from one bulb into the other at a faster rate, it is possible to achieve a shimmering effect wherein the lamps appear to be in motion. The lamps could also be made to change color or brightness in time with music or other special effects.
- Turning now to
FIG. 9 d, a schematic of a light string in combination with a power source having terminals T300 and T400 is shown. In this embodiment, if the current is flowing from terminal T300 to T400, the current flows through diode D700, the top filament F100 to T400, thus only lighting the top filament F100. If the direction of the current is reversed, so that it travels from terminal T400 to terminal T300, the current flows through the bottom filament F200, through the diode D800 and to terminal T300. The advantage of this design, is that the diodes D700 and D800 are part of the base of the light string, and not included in the power supply. This allows the light string to operate with fewer wires on the outside, which is more aesthetically pleasing and cheaper to manufacture. -
FIG. 9 e illustrates an embodiment of the present invention where two power sources are used. In this embodiment, power is supplied by both aDC power supply 500 and an AC power supply 510. Depending upon the direction of the current flow, the current passes through either diode 720 to the bulb or filament 520 or through diode 710 to the bulb orfilament 540. By varying the amplitude of each supply relative to the other, the individual brightness of each bulb (520 or 540) can be controlled at will. This is just one example of using multiple power supplies. Other known methods may also be utilized. -
FIG. 9 f illustrates another embodiment of the present invention for manipulating current flow. In this embodiment, anAC power supply 600 produces a low voltage AC output. Acenter tap 605 is attached to thepower supply 600. A fullwave rectifier bridge 610 is connected to theAC power supply 600 and generates two DC sources. One is positive and the other negative. A single pole triple throwelectronic switch 620 switches between the positive DC source, the negative DC source, or no source (position NC) at all. This then controls which of the two bulbs orfilaments 630, 640, if either, receive any current. By switching at a sufficiently fast rate, and controlling the amount oftime switch 620 remains closed in each position, the individual brightness of each bulb (630 or 640) can be controlled at will. -
FIGS. 10 and 11 illustrate a modified bulb base and socket construction that facilitates the replacement of a failed bulb. Thebulb 130 inFIGS. 10 and 11 has the same construction described above, including afilament 131 and a pair of filament leads 132 and 133 held in place by aglass bead 134. The leads 132 and 133 extend downwardly through a moldedplastic base 135 that fits into acomplementary socket 136. In this modified embodiment, thebulb base 135 includes a pair of diametricallyopposed lugs removal ring 139 between the top surfaces of the lugs and theunderside 140 of theflange 141 of thebase 135. Thecentral opening 142 of thering 139 is dimensioned to have a diameter just slightly smaller than that of theflange 141 so that the ring can be forced upwardly over thelugs ring 139 snaps over the top surfaces of the lugs, adjacent the underside of theflange 141. Thering 139 is then captured on thebase 135, but can still rotate relative to the base. - To hold the
bulb base 135 in thesocket 136, thering 139 forms a hinged,apertured tab 143 that can be bent downwardly to fit over a latchingelement 144 formed on the outer surface of thesocket 136. When the bulb fails, thetab 143 is pulled downwardly and away from thesocket 136 to release it from thesocket 136, and then thetab 143 is used to rotate thering 139 to assist in removing the bulb and itsbase 135 from thesocket 136. As thering 139 is rotated, a descendingramp 145 molded as an integral part of the ring engages aramp 146 formed by acomplementary notch 147 in the upper end of thesocket 136. When thebulb base 135 and the socket are initially assembled, theramp 145 on thering 139 nests in thecomplementary notch 147. But when thering 139 is rotated relative to thesocket 136, the engagement of the tworamps bulb base 135 out of thesocket 136. -
FIG. 12 is a generalized schematic diagram of a power supply for converting a standard 120-volt, 60-Hz input atterminals terminals -
- continuous dimming capability from very low light level to full light level,
- multi-level dimming capability,
- energy-saving and minimum-light-setting features,
- soft-start feature to increase the lamp life,
- soft start feature to reduce inrush current in the circuit, and
- low cost with multi-feature lighting.
- The AC input from the
terminals buses - The capacitors C23, C24 form a voltage divider, and one end of the primary winding TP of an output transformer T22 is connected to a point between the two capacitors. The secondary windings TS21 and TS22 of the transformer T22 are connected to the
output terminals - An integrated circuit driver IC21, such as an IR2153 driver available from International Rectifier, drives the half bridge MOSFET transistors Q21 and Q22. The power supply for the driver IC21 is derived from the DC bus through a resistor R25 and a parallel combination of capacitors C28 and C29. The capacitor C28 may be an electrolytic or an a film capacitor, and the capacitor C29 is preferably a film-type capacitor offering a high-frequency de-coupling characteristic to the driver IC21. A zener diode VZ22 clamps the voltage at VCC input pin 1 of IC21 to ensure a safe operating limit. The zener diode VZ22 along with the resistor R25 provide a regulated power supply for the driver IC21. A diode D22 and a capacitor C31 provide a boot-strap mechanism for power storage to turn on the MOSFET Q21 of the half bridge.
- The frequency of oscillation of the MOSFET driver is determined by the total resistance connected across
pins 2 and 3 of the driver IC21 together with the capacitance from pin 3 to ground. The two outputs of IC21, pins 7 and 5, are connected to the gates of the MOSFETs Q21 and Q22. A resistor R21 limits the gate current of the MOSFET Q21, while R24 limits the gate current of MOSFET Q22. A pair of resistors R22 and R23 are connected across the MOSFETs Q21 and Q22 to reduce noise sensitivity to avoid any spurious turn-on of the MOSFETs. Resistor/capacitor combinations R27/C32 and R28/C33 are tied across the two MOSFETs Q21 and Q22 as snubbers to quench transient voltage surges at the turn-off of these transistors. - When power is applied to the circuit, the voltage developed on the
bus 167 causes voltage to be applied to the IC21's VCC input. This causes the driver IC21 to start oscillating and start driving the half-bridge transistors Q21 and Q22 alternately. This applies voltage across the primary winding TP of the transformer T22, which in turn applies voltage across the secondary windings TS21 and TS22 of the transformer, which is applied to the load. - The rectified output of the
DC bus 167 is applied is applied to the Vcc pin 1 of the driver IC21 through a resistor R25. A zener diode VZ22 and capacitors C28 and C29, connected between the Vcc pin 1 and ground, provide decoupling and voltage regulation for the driver IC21. The two outputs of IC21 atpins - The RMS output voltage can be varied by controlling the on/off ratio of the pulse width applied to the primary of the transformer T22. A limited dimming control can be achieved by varying the frequency of the oscillation signal from the integrated circuit IC21. The output voltage is controlled by the potentiometer P21 connected to the integrated circuit, which permits the user to adjust the light output to the desired level.
- The dimming feature can be used to provide different fixed light levels, such as a low light output, an energy-saving output, or a full-light output. These three light levels can be achieved by use of three fixed resistors in place of the potentiometer P21. The three resistor settings can be selected by use of a three-position switch. A low-light output corresponds to a minimum output voltage, and a full-light output corresponds to maximum output voltage. An energy-saving output corresponds to an intermediate light level such as a 75% light output.
- The bulb life can be extended by soft starting the driver IC21, so that the IC starts with minimum light output and slowly ramps up to the full or desired light level. At the time of start, the bulbs in the light string are normally cold, and the cold resistance of the bulbs is very low. The cold resistance of a bulb is typically ten times lower than the steady state, full-light operating resistance. If the full voltage were applied to a cold bulb at startup, the inrush bulb current could be ten times the rated current of the bulb, which could cause the bulb filament to weaken and ultimately break. By soft starting the control circuit, the voltage applied during starting of the bulb is significantly lower. As the bulb heats up and the bulb resistance increases, the voltage is increased. Thus the bulb current never exceeds its hot rating, which increases bulb life.
- Soft starting of the circuit also helps reduce the inrush current from the circuit, thereby avoiding any interaction with other circuits or appliances. Soft starting in this circuit can be achieved by starting the driver IC21 at a high frequency and then reducing it to the normal operating frequency after a short delay, e.g. one second. This is possible because it is characteristic of this supply that higher switching frequencies tend to reduce supply output, causing the lamps to dim. A typical method for achieving soft starting is shown in
FIG. 12 . When the power supply is first turned on, voltage is applied to pin 1 (Vcc) of IC21, enabling it to operate. Voltage is also applied to resistor R93. This causes capacitor C96 to begin to charge up. During this time, transistor Q90 is ‘off’. The switching frequency of the supply is determined by the resistance betweenpins 2 and 3 of IC21 in combination with the capacitance from pin 3 to ground. Since the transistor Q90 is ‘off’, that capacitance is capacitor C30 in series with capacitor C95, which causes the supply to switch at a very high frequency and its output to be correspondingly low. The lights attached glow dimly. After about one second capacitor C96 charges up, causing transistor Q90 to turn on. Transistor Q90 and diode D95 now effectively short out capacitor C95 so that only capacitor C30 is left in the circuit. This causes the power supply to switch at a lower frequency, insuring normal lamp brightness. It should be understood that this is only one of many known methods of achieving the soft-start function. - If a wider range of dimming control is needed, the driver IC21 can be replaced by another integrated circuit, such as an IR21571, to drive the FETs, it is capable of providing pulse width modulation. The output can be controlled from low light to full light.
- The particular embodiment illustrated in
FIG. 12 is a half bridge circuit and a typical example, but it will be understood that the features of this circuit can be incorporated in other topologies such as flyback, forward, buck, full bridge or other power converters, including isolated as well as non-isolated power converter designs. -
FIG. 13 illustrates a mounting arrangement for ahousing 170 containing any of the power supplies described above, on a pre-lit artificial tree having a central “trunk”pole 171 and multiple branches such as branches 172-174 extending laterally from asupport collar 175 on thepole 171. Each branch carries a portion of one of multiple light strings attached to connectors on thehousing 170. In the illustrative embodiment, twosuch connectors housing 170 for receivingmating connectors conductors connectors connectors housing 170. - In an artificial tree having two or more vertical sections, the
power supply housing 170 is preferably mounted on theuppermost collar 175 in the lowest of the three sections. Then one of the twoconnectors output connectors - As can be seen in
FIG. 13 , theouter end panel 182 of thehousing 170 is most accessible to the user. Thisend panel 182 carries a manually operated on-off switch 183 for turning the power supply on and off, and anindicator light 184 that is illuminated whenever the power supply is connected to a power source. Adimmer knob 185 connected to a potentiometer permits the user to control the light level by adjusting the position of the potentiometer. Abulb socket 186 permits the user to test a bulb by connecting the bulb to an appropriate power source within the housing. Thepanel 182 also contains adrawer 187 for storage of spare bulbs and fuses. Power for the circuitry within thehousing 170 is supplied viacord 188. - To mount the
housing 170 on thecollar 175, ahook 189 extends upwardly from the housing. The weight of thehousing 170 forces the lower end of theinside panel 190 against thepole 171, and ayoke 191 projecting from the inside panel keeps the housing centered on the pole. - The two pairs of
conductors connector block 193 typically receives the connectors on a multiplicity of light strings mounted on the bottom section(s) of a pre-lit tree. The other connector block 192 typically receives a multiplicity of light strings for the middle section of the tree. The top section(s) of the tree typically includes two or more light strings, which are connected to a smallerthird connector block 196 connected to theblock 192 viamating connectors respective blocks -
FIG. 14 is another schematic diagram of a power supply for converting a standard 120-volt, 60-Hz input atterminals terminals -
- continuous dimming capability from very low light level to full light level,
- multi-level dimming capability,
- energy-saving and minimum-light-setting features,
- soft-start feature to increase the lamp life,
- soft start feature to reduce inrush current in the circuit, and
- low cost with multi-feature lighting.
- The AC input from the
terminals - The capacitors C223, C224 form a virtual center tap. One end of the primary winding TP of an output transformer T222 is connected to a point between the two capacitors. The secondary winding TS of the transformer T222 is connected to the
output terminals - An integrated circuit driver U201, such as a IR21571D controller available from International Rectifier, controls the switching frequency of oscillation and other features indicated above. The power supply Vcc for the driver U201 is derived from the DC bus 267 through resistors R201 and R202 to an internal zener diode. The device includes protection elements which prohibit starting oscillation (operation) until the power supply voltages are in tolerance or if there is a fault which interferes with the proper sequencing of voltages VDC, VCC, and VSD. Diodes D202, D203, D204 and capacitors C209, C210 and C211 provide a boot-strap mechanism for powering the IC. Capacitors C212 and C218 provide bulk storage to start the controller at power up.
- The frequency of oscillation of the controller is determined by the total resistance connected between pin 12 (Corn) and
pin 4 of the controller U201 and a capacitor C213 connected betweenpin 6 and pin 12 (Corn) of the controller U201. The two outputs of U201 atpins - When power is applied to the circuit, the voltage developed on the bus 267 causes voltage to be applied to U201 VCC, VDC, and SD. This causes U201 to start oscillating and start driving the half-bridge transistors Q221 and Q222 alternately. This applies voltage across the primary winding TP of the transformer T222, which in turn applies voltage across the secondary winding TS of the transformer, which is applied to the load.
- The rectified output of the DC bus 267 is applied to the Vcc and VDC pins of the controller U201 through resistors R201 and R202. An internal zener diode and capacitors C218 and C212 maintain the operating voltages for the controller. A voltage divider consisting of a thermistor TH201 and R205 sets the voltage at pin 9 (SD) of U201. The controller uses these three voltages to determine the state of the power bus 267 to prevent operation when the power bus has collapsed.
- The preset output voltage is set by the turns ratio of the output transformer T222. A limited dimming control is achieved by adjusting the resistance that appears between
pins terminals - The dimming feature can be used to provide different fixed light levels, such as a low light output, an energy-saving output, or a full-light output. These three light levels can be achieved by use of three fixed resistors in place of the potentiometer R214. The three resistor settings can be selected by use of a three-position switch. A low-light output corresponds to a maximum output dead time, and a full-light output corresponds to minimum dead time. An energy-saving output corresponds to an intermediate light level such as a 75% light output.
- The controller has an additional control pin (SD) which can be used as a thermal shutdown control to protect the power supply from overheating. As the air temperature in the unit rises, the value of TH201 will decline until the voltage appearing at
pin 9 of U201 rises above the shut down value of approximately 2.0 volts. - The particular embodiment illustrated in
FIG. 14 employs a half bridge circuit, but it will be understood that the features of this circuit can be incorporated in other topologies such as flyback, forward, buck, full bridge or other power converters, including isolated as well as non-isolated power converter designs. - While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims.
Claims (144)
1. A string of decorative lights comprising
a power supply having an input adapted for connection to a standard residential electrical power outlet, the power supply including circuitry for converting the standard residential voltage to a low-voltage output, the input connected through a fusing device to a rectifier circuit,
a pair of conductors connected to the output of the power supply for supplying the low-voltage output to multiple decorative lights, and
multiple lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors.
2. A string of decorative lights as set forth in claim 1 wherein each of the lights is about a half-watt bulb.
3. A string of decorative lights as set forth in claim 1 wherein each of the lights requires a voltage of about 12 volts or less.
4. A string of decorative lights as set forth in claim 1 wherein the lights are connected in parallel across the conductors in parallel groups of two to five lights per group, the lights within each group being connected in series.
5. A string of decorative lights as set forth in claim 1 wherein the standard residential voltage is 120 volts and approximately 52 6-volt lights are connected to the conductors.
6. A string of decorative lights as set forth in claim 1 wherein the low-voltage output is DC or AC.
7. A string of decorative lights as set forth in claim 1 wherein the rectifier circuit is a diode bridge.
8. A string of decorative lights as set forth in claim 1 wherein the low-voltage output is less than about 30 volts rms.
9. A string of decorative lights as set forth in claim 1 wherein the power supply comprises an electronic transformer.
10. A string of decorative lights as set forth in claim 1 wherein the power supply comprises a switching power supply.
11. A string of decorative lights as set forth in claim 1 wherein the power supply converts the standard residential frequency to a higher frequency output.
12. A string of decorative lights as set forth in claim 11 wherein the higher frequency is in the range from about 10 KHz to about 150 KHz.
13. A string of decorative lights as set forth in claim 1 wherein the conductors are connected to a fixed number of the lights so as to provide a fixed load on the power supply.
14. A string of decorative lights as set forth in claim 1 wherein each of the lights includes means for shunting the light in response to a failure of the light.
15. A decorative lighting system, the system comprising
a power supply having an input adapted for connection to a standard residential electrical power outlet, the power supply including circuitry for converting the standard residential voltage to a low-voltage output, the input connected through a fusing device to a rectifier circuit,
a plurality of pairs of conductors connected to the output of the power supply for supplying the low-voltage output to multiple sets of decorative lights, and
multiple lights connected to each pair of the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across each of the pairs of conductors.
16. A decorative lighting system as set forth in claim 15 wherein each of the lights is about a half-watt bulb.
17. A decorative lighting system as set forth in claim 15 wherein each of the lights requires a voltage or about 6 volts or less.
18. A decorative lighting system as set forth in claim 15 wherein each of the pairs of conductors has multiple groups of the lights connected in parallel across the conductor pair, each of the parallel groups including two to five lights connected in series within the group.
19. A decorative lighting system as set forth in claim 15 wherein the standard residential voltage is 120 volts and approximately 52 6-volt lights are connected to each of the pairs of conductors.
20. A decorative lighting system as set forth in claim 15 wherein the low-voltage output is DC.
21. A decorative lighting system as set forth in claim 15 wherein the low-voltage output is AC.
22. A decorative lighting system as set forth in claim 15 wherein the low-voltage output is less than about 30 volts rms.
23. A decorative lighting system as set forth in claim 15 wherein the power supply comprises an electronic transformer.
24. A decorative lighting system as set forth in claim 15 wherein the power supply comprises a switching power supply.
25. A decorative lighting system as set forth in claim 15 wherein the power supply converts the standard residential frequency to a higher frequency output.
26. A decorative lighting system as set forth in claim 25 wherein the higher frequency is in the range from about 10 KHz to about 150 KHz.
27. A decorative lighting system as set forth in claim 15 wherein each of the pairs of conductors is connected to a fixed number of the lights so as to provide a fixed load on the power supply.
28. A decorative lighting system as set forth in claim 15 wherein each of the lights includes means for shunting the light in response to a failure of the light.
29. A method of powering at least one string of decorative lights, the method comprising
converting a standard residential electrical voltage to a low-voltage, using a power supply having an input coupled through a fusing device to a rectifier circuit, and
supplying the low-voltage to a pair of parallel conductors having multiple decorative lights connected to the conductors along the lengths thereof, each of the lights, or groups of the lights, being connected in parallel across the conductors.
30. A method of powering a string of decorative lights as set forth in claim 29 wherein each of the lights is about a half-watt bulb.
31. A method of powering a string of decorative lights as set forth in claim 29 wherein each of the lights requires a voltage or about 6 volts or less.
32. A method of powering a string of decorative lights as set forth in claim 29 wherein the lights are connected in parallel across the conductors in parallel groups of two to five lights per group.
33. A method of powering a string of decorative lights as set forth in claim 29 wherein the standard residential voltage is 120 volts and approximately 52 6-volt lights are connected to the conductors.
34. A method of powering a string of decorative lights as set forth in claim 29 wherein the low-voltage output is DC.
35. A method of powering a string of decorative lights as set forth in claim 29 wherein the low-voltage output is AC.
36. A method of powering a string of decorative lights as set forth in claim 29 wherein the low-voltage output is less than about 30 volts rms.
37. A method of powering a string of decorative lights as set forth in claim 29 wherein an electronic transformer is used in the conversion of the standard residential electrical voltage to a low voltage.
38. A method of powering a string of decorative lights as set forth in claim 29 wherein a switching power supply is used in the conversion of the standard residential electrical voltage to a low voltage.
39. A method of powering a string of decorative lights as set forth in claim 29 wherein the standard residential frequency is converted to a higher frequency output.
40. A method of powering a string of decorative lights as set forth in claim 39 wherein the higher frequency is in the range from about 10 KHz to about 150 KHz.
41. A method of powering a string of decorative lights as set forth in claim 29 wherein a fixed load is maintained on the conductors by limiting the number of lights connected to the conductors to a fixed number.
42. A method of powering a string of decorative lights as set forth in claim 29 which includes the step of shunting each of the lights in response to a failure of that light.
43. A string of decorative lights comprising
a power source for providing current,
switch circuitry coupled to the power source, and
multiple lights connected to the power source, each of the lights, or groups of the lights, being connected with the switch circuitry, wherein the switch circuitry is adapted to manipulate the appearance of the multiple lights.
44. A string of decorative lights as set forth in claim 43 wherein the manipulation of the appearance of the multiple lights comprise changing the color of the lights, causing the lights to blink, or a combination thereof.
45. A string of decorative lights as set forth in claim 43 wherein the power source includes low-voltage circuitry for converting the standard residential voltage to a low-voltage output.
46. A string of decorative lights as set forth in claim 43 wherein the lights are connected in parallel across the switch circuitry in parallel groups of two to fifty lights per group, the lights within each group being connected in series.
47. A string of decorative lights as set forth in claim 45 wherein the standard residential voltage is 120 volts and approximately 52 6-volt lights are connected to the switch circuitry.
48. A string of decorative lights as set forth in claim 45 wherein the low-voltage output is DC.
49. A string of decorative lights as set forth in claim 45 wherein the low-voltage output is AC.
50. A string of decorative lights as set forth in claim 45 wherein the low-voltage output is less than about 30 volts rms.
51. A string of decorative lights as set forth in claim 43 wherein the power source comprises an electronic transformer.
52. A string of decorative lights as set forth in claim 43 wherein the power source comprises a switching power supply.
53. A string of decorative lights as set forth in claim 43 wherein the power source converts the standard residential frequency to a higher frequency output.
54. A string of decorative lights as set forth in claim 53 wherein the higher frequency is in the range from about 10 KHz to about 150 KHz.
55. A string of decorative lights as set forth in claim 43 wherein the switch circuitry is connected to a fixed number of the lights so as to provide a fixed load on the power source.
56. A string of decorative lights as set forth in claim 43 wherein each of the lights includes means for shunting the light in response to a failure of the light.
57. A string of decorative lights as set forth in claim 43 , further comprising a reversible plug connected to the output of the power source, the reversible plug being able to be inserted into the output in either of two orientations, and wherein the reversible plug allows for different decorative effects to be achieved depending on the orientation of the reversible plug in the outlet of the power source.
58. A string of decorative lights as set forth in claim 57 , wherein the different decorative effects comprise a color change, blinking lights, or a combination thereof.
59. A string of decorative lights as set forth in claim 57 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the plug supplies current to only one depending on the orientation of the reversible plug in the outlet, allowing for different decorative effects.
60. A string of decorative lights as set forth in claim 57 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein current is only supplied to one of the filaments, depending on the orientation of the reversible plug in the outlet, allowing for different decorative effects.
61. A string of decorative lights as set forth in claim 43 , wherein the switching circuitry includes a mechanical switch coupled to the power source, the mechanical switch being able to switch the direction of the current flow, allowing for different decorative effects to be achieved.
62. A string of decorative lights as set forth in claim 61 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the mechanical switch allows current to flow to only one of the two separate bulbs depending on the orientation of the mechanical switch, allowing for different decorative effects.
63. A string of decorative lights as set forth in claim 61 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein current is only supplied to one of the filaments, depending on the orientation of the mechanical switch, allowing for different decorative effects.
64. A string of decorative lights as set forth in claim 43 , wherein either the power supply or the switch circuitry is adapted to convert the AC current to DC current and to control the direction, amplitude or interval of the DC current through the multiple lights.
65. A string of decorative lights as set forth in claim 43 , wherein the switch circuitry comprises at least one switch adapted to allow only a predetermined portion of the AC current to go through the multiple lights.
66. A string of decorative lights as set forth in claim 43 , wherein the switching circuitry includes electronic switch circuitry coupled to the power source, the electronic switch circuitry being able to switch the direction, amplitude, or interval of the current flow, allowing for different decorative effects to be achieved.
67. A string of decorative lights as set forth in claim 66 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the electronic switch circuitry allows current to flow to only one or neither of the two separate bulbs depending on the orientation of the electronic switch circuitry, allowing for different decorative effects.
68. A string of decorative lights as set forth in claim 66 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein current is only supplied to one or neither of the filaments, depending on the orientation of the electronic switch circuitry, allowing for different decorative effects.
69. A string of decorative lights as set forth in claim 66 , wherein the electronic switch circuitry includes at least one of a TRIAC, DIAC, SCR, diode, or a transistor.
70. A string of decorative lights as set forth in claim 43 , wherein the switch circuitry, power source, or combination thereof is adapted to convert the AC current to DC current and to control the direction of the DC current through the multiple lights.
71. A string of decorative lights as set forth in claim 43 , wherein the switch circuitry comprises a switch adapted to allow only predetermined portions of the AC current to go through the multiple lights.
72. A string of decorative lights comprising
a first power source,
a second power source connected to the first power source, and
multiple lights connected to the first and second power sources, wherein the first and second power supplies are adapted to manipulate the appearance of the multiple lights.
73. A string of decorative lights as set forth in claim 72 wherein each of the lights is about a half-watt bulb.
74. A string of decorative lights as set forth in claim 72 wherein the first power source includes low-voltage circuitry for converting the standard residential voltage to a low-voltage output.
75. A string of decorative lights as set forth in claim 72 wherein the first power source is an AC power source and the second power source is a lower frequency AC power source.
76. A string of decorative lights as set forth in claim 72 wherein the first power source is an AC power source and the second power source is a DC power source.
77. A string of decorative lights as set forth in claim 72 wherein at least one of the first and second power sources comprises an electronic transformer.
78. A string of decorative lights as set forth in claim 72 wherein at least one of the first and second power sources comprises a switching power supply.
79. A string of decorative lights as set forth in claim 72 wherein the first and second power sources are connected to a fixed number of the lights so as to provide a fixed load on the first and second power sources.
80. A string of decorative lights as set forth in claim 72 wherein each of the lights includes means for shunting the light in response to a failure of the light.
81. A string of decorative lights as set forth in claim 72 , wherein first and second power sources are coupled so as to alter the amount and direction of current directed through the light string, allowing for different decorative effects to be achieved.
82. A string of decorative lights as set forth in claim 81 , wherein the different decorative effects comprise a color change, blinking lights, or a combination thereof.
83. A string of decorative lights as set forth in claim 81 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the first and second power sources supply current to only one, allowing for different decorative effects.
84. A string of decorative lights as set forth in claim 81 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the first and second power sources supply differing amounts of current to each of the two separate bulbs, allowing for different decorative effects.
85. A string of decorative lights as set forth in claim 81 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein current is only supplied to one of the filaments, allowing for different decorative effects.
86. A string of decorative lights as set forth in claim 81 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein differing amounts of current is supplied to each of the filaments, allowing for different decorative effects.
87. A string of decorative lights comprising
an AC power supply having an input adapted for connection to a standard residential electrical power outlet, the standard residential electrical power outlet providing AC current,
a rectifier coupled to the AC power supply for generating two DC power sources,
switch circuitry coupled to the rectifier and including at least one switch, and
multiple lights connected to the switch circuitry, each of the lights, or groups of the lights, being connected with the switch circuitry, wherein the switch circuitry is adapted to manipulate the appearance of the multiple lights.
88. A string of decorative lights as set forth in claim 87 wherein each of the lights is about a half-watt bulb.
89. A string of decorative lights as set forth in claim 87 wherein the lights are connected in parallel across the switch circuitry in parallel groups of two to fifty lights per group, the lights within each group being connected in series.
90. A string of decorative lights as set forth in claim 87 wherein the standard residential voltage is 120 volts and approximately 52 6-volt lights are connected to the switch circuitry.
91. A string of decorative lights as set forth in claim 87 wherein the switch circuitry is connected to a fixed number of the lights so as to provide a fixed load on the power source.
92. A string of decorative lights as set forth in claim 87 wherein each of the lights includes means for shunting the light in response to a failure of the light.
93. A string of decorative lights as set forth in claim 87 , wherein the switch circuitry is adapted to provide the function of a single pole triple throw electronic switch.
94. A string of decorative lights as set forth in claim 87 , wherein the switch circuitry alters the current flow, allowing for different decorative effects to be achieved.
95. A string of decorative lights as set forth in claim 94 , wherein the different decorative effects comprise a color changes, blinking lights or a combination thereof.
96. A string of decorative lights as set forth in claim 94 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the switch circuitry supplies differing amounts of current to each bulb, allowing for different decorative effects.
97. A string of decorative lights as set forth in claim 94 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the switch supplies differing amounts of current to each of the filaments, allowing for different decorative effects.
98. A string of decorative lights comprising
an AC power supply having an input adapted for connection to a standard residential electrical power outlet, the standard residential electrical power outlet providing AC current,
first switch circuitry coupled to the AC power supply and including a switch,
second switch circuitry coupled to the AC power supply and including a switch, the first switch circuitry being in an on position when the second switch circuitry is in an off position, the first switch circuitry being in an off position when the second switch circuitry is in an on position, or both the first and second switch circuitry being in an off position, and
multiple lights connected to the first and second switching circuits, wherein the manipulation of the current by altering the percentage that the first switch circuitry is on relative to the second switch circuitry alters the appearance of the multiple lights.
99. A string of decorative lights as set forth in claim 98 wherein each of the lights is about a half-watt bulb.
100. A string of decorative lights as set forth in claim 98 wherein the power source, switch circuitry, or both comprises a TRIAC, DIAC, an SCR, or other electronic switching circuitry.
101. A string of decorative lights as set forth in claim 98 wherein the switch circuitry is connected to a fixed number of the lights so as to provide a fixed load on the power source.
102. A string of decorative lights as set forth in claim 98 wherein each of the lights includes means for shunting the light in response to a failure of the light.
103. A string of decorative lights as set forth in claim 98 , wherein the manipulation of the current allows for different decorative effects to be achieved.
104. A string of decorative lights as set forth in claim 103 , wherein the different decorative effects comprise a color changes, blinking lights, or a combination thereof.
105. A string of decorative lights as set forth in claim 98 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the amount of current supplied to the two separate bulbs is altered, allowing for different decorative effects.
106. A string of decorative lights as set forth in claim 98 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the amount of current supplied to each of the filaments is altered, allowing for different decorative effects.
107. A method for manipulating lights on a string of decorative lights comprising
providing a power source providing current,
providing switching circuitry coupled to the power source with at most two wires, and
altering the switching circuitry in order to manipulate the current in order to alter the appearance of multiple lights connected to the power source.
108. The method of claim 107 further comprising converting the standard residential voltage to a low-voltage output.
109. The method of claim 107 wherein the step of supplying the power source comprises converting the standard residential frequency to a higher frequency output.
110. The method of claim 107 wherein the switching is performed by switch circuitry and the method further comprises providing a fixed load on the power source by connecting the switch circuitry to a fixed number of the lights so as to provide a fixed load on the power source.
111. The method of claim 107 further comprising shunting one of the multiple lights in response to a failure of the one of the multiple lights.
112. The method of claim 107 , wherein the manipulation of the switching circuitry allows for different decorative effects to be achieved.
113. The method of claim 112 , wherein the different decorative effects comprise a color change, blinking lights, or a combination thereof.
114. The method of claim 112 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the method comprising supplying current to only one of the two bulbs, depending on the orientation of the switching circuitry, allowing for different decorative effects.
115. The method of claim 112 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, the method further comprising only supplying current to one of the filaments, depending on the orientation of the switching circuitry, allowing for different decorative effects.
116. The method of claim 107 , wherein the switching circuitry includes a mechanical switch coupled to the power source, the method further comprising switching the direction of the current flow, via the mechanical switch, allowing for different decorative effects to be achieved.
117. The method of claim 116 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the method comprising allowing current to flow to only one of the two separate bulbs, depending on the orientation of the mechanical switch, allowing for different decorative effects.
118. The method of claim 116 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, the method further comprising supplying current to one of the filaments, depending on the orientation of the mechanical switch, allowing for different decorative effects.
119. The method of claim 107 , wherein the step of altering the switch circuitry includes allowing only a predetermined portion of the AC current to go through the multiple lights.
120. The method of claim 107 , wherein the switching circuitry includes at least one electronic switch coupled to the power source, the method further comprising switching the direction, amplitude, and interval of the current flow, via the electrical switch, allowing for different decorative effects to be achieved.
121. The method of claim 120 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the switching of the at least one electronic switch includes allowing current to flow to only one or neither of the two separate bulbs depending on the orientation of the at least one electronic switch, allowing for different decorative effects.
122. The method of claim 120 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the step of switching the at least one electronic switch includes supplying current to only one or neither of the filaments, depending on the orientation of the at least one electronic switch, allowing for different decorative effects.
123. The method of claim 107 , further comprising converting an AC current to DC current and controlling the direction of the DC current through the multiple lights.
124. The method of claim 107 , the altering step including allowing only a predetermined portion of the current to go through the multiple lights.
125. A method for manipulating lights on a string of decorative lights comprising
providing a first power source providing current,
providing a second power source coupled to the first power source, and
controlling the output of the first and second power sources in order to manipulate the current in order to alter the appearance of multiple lights connected to the first and second power sources, creating different decorative effects.
126. The method of claim 125 wherein the first power source is an AC power source and the second power source is a lower frequency AC power source.
127. The method of claim 125 wherein the first power source is an AC power source and the second power source is a DC power source.
128. The method of claim 125 , wherein the different decorative effects comprise a color change, blinking lights, or a combination thereof.
129. The method of claim 125 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the method comprising supplying current to only one of the bulbs, allowing for different decorative effects.
130. The method of claim 125 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, and the method comprising supplying differing amounts of current via the first and second power sources, to each of the two separate bulbs, allowing for different decorative effects.
136. The method of claim 125 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the controlling step includes supplying current, via the first and second power sources, to only one of the filaments, allowing for different decorative effects.
137. The method of claim 125 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the step of controlling comprises supplying differing amounts of current to each of the filaments, via the first and second power sources, allowing for different decorative effects.
138. A method for manipulating lights on a string of decorative lights comprising
providing an AC power source providing current,
providing a rectifier coupled to the AC power supply for generating two DC power sources,
providing switching circuitry coupled to the rectifier, and
altering the switching circuitry in order to manipulate the current in order to alter the appearance of multiple lights connected to the power source.
139. The method of claim 138 , wherein the switch circuitry functions as a single pole triple throw electronic switch.
140. The method of claim 138 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, wherein the step of altering the switching circuitry includes supplying differing amounts of current to each bulb, allowing for different decorative effects.
141. The method of claim 138 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the step of altering the switching circuitry includes supplying differing amounts of current to each of the filaments, allowing for different decorative effects.
142. A method for manipulating lights on a string of decorative lights comprising
providing an AC power source providing current,
providing first switch circuitry coupled to the AC power supply and including a switch,
providing second switch circuitry coupled to the AC power supply and including a switch, the first switch circuitry being in an on position when the second switch circuitry is in an off position, the first switch circuitry being in an off position when the second switch circuitry is in an on position, or both the first and second switch circuitry being in an off position, and
altering the switching circuitry in order to manipulate the percentage that the first switch circuitry is on relative to the second switch circuitry alters the appearance of the multiple lights.
143. The method of claim 142 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing two separate bulbs, wherein the altering step includes altering the amount of current supplied to the two separate bulbs, allowing for different decorative effects.
144. The method of claim 142 , wherein the light string comprises a plurality of sockets, each of the plurality of sockets containing one bulb, and each bulb containing two filaments, wherein the step of altering includes altering the amount of current supplied to each of the filaments, allowing for different decorative effects.
145. A string of decorative lights comprising:
a plurality of elongated electrical conductors having multiple electrical lamps inserted into sockets connected thereto at intervals along the lengths of the conductors, and
a small compartment, the compartment including a wall forming a first opening adapted to receive in frictional engagement a base of an electrical lamp, the compartment also including a first member adapted to engage a second member on the socket.
146. The string of decorative lights of claim 145 wherein the first member is a first ramp and the second member is a second ramp, the first ramp being designed to engage a second ramp on the socket to assist in removing the electrical lamp from the socket.
147. A method of removing failed bulbs in a string of decorative lights, the method comprising:
providing a small compartment, the compartment including a wall forming a first opening,
pressing the opening between a top surface of a socket holding a bulb and the bulb,
twisting the small compartment to loosen the bulb in the socket,
removing the bulb from the socket, and
attaching the compartment to the string of decorative lights so that the opening is conveniently accessible when needed to replace a component in the light string.
148. A string of decorative lights comprising
a power source for providing current, and
multiple lights connected to the power source, each of the lights comprising a socket containing one bulb, and each bulb containing two filaments, and a diode connected to each filament, such that when current is supplied to the socket, only one of the filaments receives current, depending on the direction of the current, allowing for different decorative effects.
149. A string of decorative lights comprising
a power source for providing current, and
multiple lights connected to the power source, each of the lights comprising a socket containing two bulbs, and each bulb containing one filament, and a diode connected to each of the two bulbs, such that when current is supplied to the socket, only one of the bulbs receives current, depending on the direction of the current, allowing for different decorative effects.
Priority Applications (1)
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US10/961,302 US20050122723A1 (en) | 2001-03-19 | 2004-10-08 | Decorative light strings and repair device |
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US09/854,255 US20020168890A1 (en) | 2001-05-14 | 2001-05-14 | Light plug with storage compartment |
US10/041,032 US6734678B2 (en) | 2001-03-20 | 2001-12-28 | Repair device for decorative light shunt |
US10/068,452 US6561673B2 (en) | 2001-05-14 | 2002-02-06 | Decorative light string with storage compartment for replacement components |
PCT/US2002/007609 WO2002075862A1 (en) | 2001-03-19 | 2002-03-13 | Decorative light string having shunt repair device |
US10/479,010 US20050024877A1 (en) | 2001-03-19 | 2002-03-13 | Decorative light strings and repair device |
US10/961,302 US20050122723A1 (en) | 2001-03-19 | 2004-10-08 | Decorative light strings and repair device |
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US10/068,452 Continuation-In-Part US6561673B2 (en) | 2001-03-19 | 2002-02-06 | Decorative light string with storage compartment for replacement components |
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US10/479,010 Continuation US20050024877A1 (en) | 2001-03-19 | 2002-03-13 | Decorative light strings and repair device |
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Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070018594A1 (en) * | 2005-06-08 | 2007-01-25 | Jlj. Inc. | Holiday light string devices |
US7253556B1 (en) | 2006-12-08 | 2007-08-07 | Tech Patent Licensing, Llc | Light string socket with mechanical shunt |
US20080231213A1 (en) * | 2007-03-21 | 2008-09-25 | Xuliang Li | LED String Lights |
US20090190359A1 (en) * | 2008-01-28 | 2009-07-30 | Cindex Holdings Limited (A Hong Kong Corporation) | Led light string system |
US7609006B2 (en) | 2008-02-18 | 2009-10-27 | Ventur Research And Development Corp. | LED light string with split bridge rectifier and thermistor fuse |
US20090279325A1 (en) * | 2005-06-02 | 2009-11-12 | Gp Ltd. | Light string system |
US20100003891A1 (en) * | 2007-12-06 | 2010-01-07 | Willis Electric Co., Ltd. | Three dimensional displays having deformable constructions |
US20100099285A1 (en) * | 2008-10-20 | 2010-04-22 | Cindex Holdings Limited (A Hong Kong Corporation) | Light string system |
US20100207541A1 (en) * | 2009-02-15 | 2010-08-19 | Arciuolo Thomas F | Electrical device for end user control of electrical power and lighting characteristics |
US20100289415A1 (en) * | 2009-05-18 | 2010-11-18 | Johnny Chen | Energy efficient decorative lighting |
US20110085327A1 (en) * | 2009-10-14 | 2011-04-14 | Johnny Chen | Decorative light display with LEDs |
US8870404B1 (en) | 2013-12-03 | 2014-10-28 | Willis Electric Co., Ltd. | Dual-voltage lighted artificial tree |
US8876321B2 (en) | 2011-12-09 | 2014-11-04 | Willis Electric Co., Ltd. | Modular lighted artificial tree |
US8936379B1 (en) | 2010-09-23 | 2015-01-20 | Willis Electric Co., Ltd. | Modular lighted tree |
US9044056B2 (en) | 2012-05-08 | 2015-06-02 | Willis Electric Co., Ltd. | Modular tree with electrical connector |
US9140438B2 (en) | 2013-09-13 | 2015-09-22 | Willis Electric Co., Ltd. | Decorative lighting with reinforced wiring |
US9157588B2 (en) | 2013-09-13 | 2015-10-13 | Willis Electric Co., Ltd | Decorative lighting with reinforced wiring |
US9157587B2 (en) | 2011-11-14 | 2015-10-13 | Willis Electric Co., Ltd. | Conformal power adapter for lighted artificial tree |
US9179793B2 (en) | 2012-05-08 | 2015-11-10 | Willis Electric Co., Ltd. | Modular tree with rotation-lock electrical connectors |
US9222656B2 (en) | 2011-11-14 | 2015-12-29 | Willis Electric Co., Ltd. | Conformal power adapter for lighted artificial tree |
US9439528B2 (en) | 2013-03-13 | 2016-09-13 | Willis Electric Co., Ltd. | Modular tree with locking trunk and locking electrical connectors |
US9572446B2 (en) | 2012-05-08 | 2017-02-21 | Willis Electric Co., Ltd. | Modular tree with locking trunk and locking electrical connectors |
US9671074B2 (en) | 2013-03-13 | 2017-06-06 | Willis Electric Co., Ltd. | Modular tree with trunk connectors |
US9883566B1 (en) | 2014-05-01 | 2018-01-30 | Willis Electric Co., Ltd. | Control of modular lighted artificial trees |
US9883706B2 (en) | 2011-05-20 | 2018-02-06 | Willis Electric Co., Ltd. | Multi-positional, locking artificial tree trunk |
US9894949B1 (en) | 2013-11-27 | 2018-02-20 | Willis Electric Co., Ltd. | Lighted artificial tree with improved electrical connections |
US10206530B2 (en) | 2012-05-08 | 2019-02-19 | Willis Electric Co., Ltd. | Modular tree with locking trunk |
US10683974B1 (en) | 2017-12-11 | 2020-06-16 | Willis Electric Co., Ltd. | Decorative lighting control |
US10711954B2 (en) | 2015-10-26 | 2020-07-14 | Willis Electric Co., Ltd. | Tangle-resistant decorative lighting assembly |
Families Citing this family (66)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7038399B2 (en) * | 2001-03-13 | 2006-05-02 | Color Kinetics Incorporated | Methods and apparatus for providing power to lighting devices |
US6734678B2 (en) | 2001-03-20 | 2004-05-11 | Integrated Power Components, Inc. | Repair device for decorative light shunt |
US7276911B2 (en) | 2001-03-20 | 2007-10-02 | Integrated Power Components, Inc. | Detection of malfunctioning bulbs in decorative light strings |
FR2833425B1 (en) * | 2001-12-10 | 2005-03-04 | Jean Paul Blachere | ELECTRONIC TRANSFORMER FOR LIGHTING GUILT |
JP2005197304A (en) * | 2003-12-26 | 2005-07-21 | Toki Corporation Kk | Light emitting device |
US7163316B2 (en) * | 2004-08-18 | 2007-01-16 | Jeng-Shyong Wu | Multi-functional ornamental lighting equipment |
US20070103916A1 (en) * | 2005-11-07 | 2007-05-10 | Jeng-Shyong Wu | Lamp holder device with function element |
CN2861719Y (en) * | 2005-11-28 | 2007-01-24 | 林书弘 | Lamp string |
US20080018261A1 (en) * | 2006-05-01 | 2008-01-24 | Kastner Mark A | LED power supply with options for dimming |
US7777699B2 (en) * | 2006-05-01 | 2010-08-17 | Barco, Inc. | Display system having pixels |
US7607798B2 (en) * | 2006-09-25 | 2009-10-27 | Avago Technologies General Ip (Singapore) Pte. Ltd. | LED lighting unit |
CN201047519Y (en) * | 2007-06-18 | 2008-04-16 | 东莞勤上光电股份有限公司 | String lights group |
US8118447B2 (en) | 2007-12-20 | 2012-02-21 | Altair Engineering, Inc. | LED lighting apparatus with swivel connection |
US7712918B2 (en) | 2007-12-21 | 2010-05-11 | Altair Engineering , Inc. | Light distribution using a light emitting diode assembly |
US7914185B2 (en) * | 2008-01-17 | 2011-03-29 | Moore Brenda A | Christmas light clips with magnets |
US8360599B2 (en) | 2008-05-23 | 2013-01-29 | Ilumisys, Inc. | Electric shock resistant L.E.D. based light |
US7976196B2 (en) | 2008-07-09 | 2011-07-12 | Altair Engineering, Inc. | Method of forming LED-based light and resulting LED-based light |
US7946729B2 (en) | 2008-07-31 | 2011-05-24 | Altair Engineering, Inc. | Fluorescent tube replacement having longitudinally oriented LEDs |
US8674626B2 (en) | 2008-09-02 | 2014-03-18 | Ilumisys, Inc. | LED lamp failure alerting system |
US8256924B2 (en) | 2008-09-15 | 2012-09-04 | Ilumisys, Inc. | LED-based light having rapidly oscillating LEDs |
US7938562B2 (en) | 2008-10-24 | 2011-05-10 | Altair Engineering, Inc. | Lighting including integral communication apparatus |
US8444292B2 (en) | 2008-10-24 | 2013-05-21 | Ilumisys, Inc. | End cap substitute for LED-based tube replacement light |
US8214084B2 (en) | 2008-10-24 | 2012-07-03 | Ilumisys, Inc. | Integration of LED lighting with building controls |
US8653984B2 (en) | 2008-10-24 | 2014-02-18 | Ilumisys, Inc. | Integration of LED lighting control with emergency notification systems |
US8901823B2 (en) | 2008-10-24 | 2014-12-02 | Ilumisys, Inc. | Light and light sensor |
US8324817B2 (en) | 2008-10-24 | 2012-12-04 | Ilumisys, Inc. | Light and light sensor |
US8556452B2 (en) | 2009-01-15 | 2013-10-15 | Ilumisys, Inc. | LED lens |
US8362710B2 (en) | 2009-01-21 | 2013-01-29 | Ilumisys, Inc. | Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays |
US8664880B2 (en) | 2009-01-21 | 2014-03-04 | Ilumisys, Inc. | Ballast/line detection circuit for fluorescent replacement lamps |
US8330381B2 (en) * | 2009-05-14 | 2012-12-11 | Ilumisys, Inc. | Electronic circuit for DC conversion of fluorescent lighting ballast |
US8299695B2 (en) * | 2009-06-02 | 2012-10-30 | Ilumisys, Inc. | Screw-in LED bulb comprising a base having outwardly projecting nodes |
EP2446715A4 (en) | 2009-06-23 | 2013-09-11 | Ilumisys Inc | Illumination device including leds and a switching power control system |
US9833098B2 (en) | 2009-07-14 | 2017-12-05 | Loominocity, Inc. | Architecture for routing multi-channel commands via a tree column |
US10993572B2 (en) | 2009-07-14 | 2021-05-04 | Belgravia Wood Limited | Power pole for artificial tree apparatus with axial electrical connectors |
US11096512B2 (en) | 2009-07-14 | 2021-08-24 | Belgravia Wood Limited | Power pole for artificial tree apparatus with axial electrical connectors |
US8098025B2 (en) * | 2009-11-30 | 2012-01-17 | Excellence Opto. Inc. | LED flash bulb decorating light |
EP2553320A4 (en) * | 2010-03-26 | 2014-06-18 | Ilumisys Inc | Led light with thermoelectric generator |
EP2553316B8 (en) | 2010-03-26 | 2015-07-08 | iLumisys, Inc. | Led light tube with dual sided light distribution |
WO2011119958A1 (en) | 2010-03-26 | 2011-09-29 | Altair Engineering, Inc. | Inside-out led bulb |
US8454193B2 (en) | 2010-07-08 | 2013-06-04 | Ilumisys, Inc. | Independent modules for LED fluorescent light tube replacement |
EP2593714A2 (en) | 2010-07-12 | 2013-05-22 | iLumisys, Inc. | Circuit board mount for led light tube |
US8523394B2 (en) | 2010-10-29 | 2013-09-03 | Ilumisys, Inc. | Mechanisms for reducing risk of shock during installation of light tube |
US8870415B2 (en) | 2010-12-09 | 2014-10-28 | Ilumisys, Inc. | LED fluorescent tube replacement light with reduced shock hazard |
US9072171B2 (en) | 2011-08-24 | 2015-06-30 | Ilumisys, Inc. | Circuit board mount for LED light |
US8863416B2 (en) | 2011-10-28 | 2014-10-21 | Polygroup Macau Limited (Bvi) | Powered tree construction |
WO2013070475A1 (en) * | 2011-11-07 | 2013-05-16 | Ulta-Lit Tree Co. | Led light string diagnostic and repair system |
US9184518B2 (en) | 2012-03-02 | 2015-11-10 | Ilumisys, Inc. | Electrical connector header for an LED-based light |
WO2014008463A1 (en) | 2012-07-06 | 2014-01-09 | Ilumisys, Inc. | Power supply assembly for led-based light tube |
US9271367B2 (en) | 2012-07-09 | 2016-02-23 | Ilumisys, Inc. | System and method for controlling operation of an LED-based light |
DE102013103673A1 (en) * | 2012-12-14 | 2014-06-18 | Weidmüller Interface GmbH & Co. KG | Lighting device and lighting arrangement for illuminating the interior of a tower or tunnel |
US9554444B2 (en) * | 2012-12-17 | 2017-01-24 | OV20 Systems | Device and method for retrofitting or converting or adapting series circuits |
US9285084B2 (en) | 2013-03-14 | 2016-03-15 | Ilumisys, Inc. | Diffusers for LED-based lights |
US9267650B2 (en) | 2013-10-09 | 2016-02-23 | Ilumisys, Inc. | Lens for an LED-based light |
WO2015112437A1 (en) | 2014-01-22 | 2015-07-30 | Ilumisys, Inc. | Led-based light with addressed leds |
US9510400B2 (en) | 2014-05-13 | 2016-11-29 | Ilumisys, Inc. | User input systems for an LED-based light |
CN107112698A (en) | 2014-11-21 | 2017-08-29 | 豪利士公开有限公司 | Electric connector |
US10149439B2 (en) * | 2014-12-18 | 2018-12-11 | Spectra Harvest Lighting, LLC | LED grow light system |
CN205790070U (en) * | 2015-01-20 | 2016-12-07 | 现代摩比斯株式会社 | Encapsulate for the LED of car light |
US9839315B2 (en) | 2015-03-27 | 2017-12-12 | Polygroup Macau Limited (Bvi) | Multi-wire quick assemble tree |
US10161568B2 (en) | 2015-06-01 | 2018-12-25 | Ilumisys, Inc. | LED-based light with canted outer walls |
US10028360B1 (en) | 2016-02-12 | 2018-07-17 | Willis Electric Co., Ltd. | Selective control of decorative lighting with control option indication |
US10917953B2 (en) * | 2016-03-21 | 2021-02-09 | X Display Company Technology Limited | Electrically parallel fused LEDs |
US10234086B2 (en) * | 2016-06-23 | 2019-03-19 | Alec Nathaniel | Decorative lighting system |
CN106641822B (en) * | 2016-11-25 | 2023-09-29 | 东莞市享达光电科技有限公司 | Full-automatic assembly equipment for producing lamp strings |
CN111355108B (en) | 2018-12-21 | 2023-02-24 | 豪利士电线装配(深圳)有限公司 | Sealing electric plug |
CN116973800B (en) * | 2023-07-27 | 2024-01-09 | 湖北协进半导体科技有限公司 | LED luminous tube and testing method thereof |
Citations (75)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1974472A (en) * | 1927-07-16 | 1934-09-25 | Emiel P Seghers | Decorative lighting for christmas trees |
US2272523A (en) * | 1941-01-10 | 1942-02-10 | Gen Electric | Electric lamp |
US2760120A (en) * | 1955-10-26 | 1956-08-21 | New York Merchandise Co Inc | Lighting system for christmas trees |
US3063006A (en) * | 1960-06-20 | 1962-11-06 | Bernard F Steinberger | Circuit continuity tester |
US3214579A (en) * | 1963-03-04 | 1965-10-26 | Mario C Pacini | Christmas tree lighting systems |
US3723723A (en) * | 1971-01-04 | 1973-03-27 | Small World Importing Corp | Christmas tree electric light decoration set |
US3789211A (en) * | 1972-07-14 | 1974-01-29 | Marvin Glass & Associates | Decorative lighting system |
US3964040A (en) * | 1974-10-29 | 1976-06-15 | Vapor Corporation | Circuit for detecting burned-out lamp for a buoy lamp changer |
US4034259A (en) * | 1976-04-14 | 1977-07-05 | Audio Visual Innovators Corporation | Spare lamp control circuit for a light projection system |
US4227228A (en) * | 1978-12-21 | 1980-10-07 | Albert V. Sadacca | Miniature socketed fuse for a decorative string of series-connected miniature incandescent lamps |
US4233543A (en) * | 1977-12-09 | 1980-11-11 | General Electric Company | Internal shunt for series connected lamps |
US4241387A (en) * | 1977-12-09 | 1980-12-23 | General Electric Company | Lamp lead to wire attachment for integral string sets |
US4253233A (en) * | 1979-05-04 | 1981-03-03 | General Electric Company | Rapidly formed electrical connection |
US4340841A (en) * | 1980-05-22 | 1982-07-20 | General Electric Company | Internal shunt for series connected lamps |
US4350407A (en) * | 1980-05-22 | 1982-09-21 | Tung Ming Electrical Co. Ltd. | Safety lamp plug |
US4425605A (en) * | 1979-01-29 | 1984-01-10 | Sam Cheng | Decorative lighting string for assembly with overcurrent protection |
US4608508A (en) * | 1984-08-31 | 1986-08-26 | Intermatch S.A. | Piezoelectric igniter, especially for a cigarette lighter or the like |
US4631650A (en) * | 1984-10-24 | 1986-12-23 | Ahroni Joseph M | Series-parallel connected miniature light set |
US4646338A (en) * | 1983-08-01 | 1987-02-24 | Kevex Corporation | Modular portable X-ray source with integral generator |
US4712586A (en) * | 1985-05-10 | 1987-12-15 | Mcgard, Inc. | Pipe plug and centering construction for centering ridged key in mating groove in pipe plug |
US4727449A (en) * | 1986-10-01 | 1988-02-23 | Chiu Technical Corporation | Filament bypass circuit |
US4799177A (en) * | 1985-12-31 | 1989-01-17 | The Boeing Company | Ultrasonic instrumentation for examination of variable-thickness objects |
US4808885A (en) * | 1986-06-18 | 1989-02-28 | U.S. Philips Corporation | Electric incandescent lamp for series arrangement having an electrically conductive vitreous body connecting oxide coated current-supply conductors |
US4855880A (en) * | 1987-11-10 | 1989-08-08 | Mancusi Jr Joseph J | Electrically enhanced artificial tree |
US4862041A (en) * | 1986-10-15 | 1989-08-29 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen M.B.H. | Dimmable electronic transformer circuit |
US4870547A (en) * | 1988-10-21 | 1989-09-26 | Crucefix Michael D | Christmas tree lights |
US4904904A (en) * | 1987-11-09 | 1990-02-27 | Lumintech, Inc. | Electronic transformer system for powering gaseous discharge lamps |
US4906901A (en) * | 1988-08-29 | 1990-03-06 | Gardenamerica Corporation | Power supply for outdoor lighting systems using high frequency |
US4943752A (en) * | 1988-09-08 | 1990-07-24 | Todd Philip A | Piezoelectric incandescent lamp test device |
US4984999A (en) * | 1990-05-17 | 1991-01-15 | Leake Sam S | String of lights specification |
US5008626A (en) * | 1990-05-17 | 1991-04-16 | Boyd Sr William P | Direct current miniature lamp tester |
US5032961A (en) * | 1989-02-27 | 1991-07-16 | Territoire De La Polynesie Francaise | Ground light system for a landing strip |
US5065067A (en) * | 1988-09-08 | 1991-11-12 | Todd Philip A | Piezoelectric circuit |
US5070522A (en) * | 1986-10-22 | 1991-12-03 | Nilssen Ole K | Combined signal and power distribution system |
US5150964A (en) * | 1991-06-21 | 1992-09-29 | Tsui Pui Hing | Joy light structure |
US5179339A (en) * | 1991-08-16 | 1993-01-12 | Volk Jr Robert C | Holiday light bulb tester with light bulb socket insertable probes |
US5180952A (en) * | 1983-04-22 | 1993-01-19 | Nilssen Ole K | Electronic track lighting system |
US5262697A (en) * | 1991-03-13 | 1993-11-16 | Laforest Bic, S.A. | Piezoelectric mechanism for gas lighters |
US5290986A (en) * | 1991-10-22 | 1994-03-01 | International Business Machines Corporation | Thermally assisted shorts removal process for glass ceramic product using an RF field |
US5317491A (en) * | 1992-08-03 | 1994-05-31 | Lee Kuo Hsing | Holder for string of electric lights |
US5319312A (en) * | 1992-07-06 | 1994-06-07 | Segilia Rocco F | Apparatus for locating inoperative miniature bulbs in a string of bulbs |
US5365145A (en) * | 1993-08-09 | 1994-11-15 | Gael, Inc. | Emergency lighting system |
US5369363A (en) * | 1992-06-23 | 1994-11-29 | Hey; Bill L. | Implement for removing and installing and testing Christmas light bulbs |
US5387845A (en) * | 1988-04-01 | 1995-02-07 | Nilssen; Ole K. | Neon lamp power supply |
US5453664A (en) * | 1994-02-01 | 1995-09-26 | Harris; Geoffrey H. | Light string with improved shunt system |
US5458241A (en) * | 1994-09-02 | 1995-10-17 | Gary Products Group, Inc. | Storage device for decorative light string |
US5495147A (en) * | 1994-04-15 | 1996-02-27 | Lanzisera; Vincent A. | LED light string system |
US5539317A (en) * | 1994-11-07 | 1996-07-23 | Jlj, Inc. | Circuit tester for Christmas tree light sets |
US5604436A (en) * | 1995-09-12 | 1997-02-18 | Henritzy; Charles L. | Christmas light string circuit tester |
US5676250A (en) * | 1995-05-22 | 1997-10-14 | Walters; Darryl Kurt | Light string mounting storage system |
US5729445A (en) * | 1994-02-07 | 1998-03-17 | Leica Mikroskopie Und Systeme Gmbh | Regulated power supply unit with an electronic transformer |
US5877618A (en) * | 1997-07-31 | 1999-03-02 | Applied Power, Inc. | Hand held non-contact voltage tester |
USD414291S (en) * | 1998-06-19 | 1999-09-21 | Gary Products Group, Inc. | Combination clip for decorative lights |
US5975717A (en) * | 1997-12-18 | 1999-11-02 | Minami International Corp. | Cascade effect icicle light set |
US6031742A (en) * | 1997-12-31 | 2000-02-29 | U.S. Philips Corporation | DC voltage converter with improved efficiency |
US6065958A (en) * | 1997-01-22 | 2000-05-23 | Bic Corporation | Utility lighter |
US6072280A (en) * | 1998-08-28 | 2000-06-06 | Fiber Optic Designs, Inc. | Led light string employing series-parallel block coupling |
US6074244A (en) * | 1997-07-25 | 2000-06-13 | Crum; Frank Andrew | Stringer of decorative lights |
US6095799A (en) * | 1997-01-22 | 2000-08-01 | Bic Corporation | Utility lighter |
US6097158A (en) * | 1997-06-03 | 2000-08-01 | Lightech Electronics Industries, Ltd. | Low voltage illumination system |
US6095796A (en) * | 1999-12-02 | 2000-08-01 | Sung; Kil Yong | Double-button piezoelectric child-resistant cigarette lighter |
US6102551A (en) * | 1998-07-27 | 2000-08-15 | Minah International Limited | Christmas lamp assembly |
US6116892A (en) * | 1998-08-28 | 2000-09-12 | Yang; John Jiin Chung | Safety flint-type lighter |
US6157551A (en) * | 1998-11-09 | 2000-12-05 | Lightech Electronics Industries Ltd. | Electronic transformer for lighting |
US6177786B1 (en) * | 1998-03-31 | 2001-01-23 | Fujitsu Limited | Power supply apparatus and method of controlling power supply circuit |
US6224228B1 (en) * | 1998-07-29 | 2001-05-01 | W. Richard Frederick | Key light |
US6294934B1 (en) * | 1997-08-29 | 2001-09-25 | Rambus Inc. | Current control technique |
US6319056B1 (en) * | 1997-07-25 | 2001-11-20 | Robert K. Schunk | Stringer of decorative lights |
US6344716B1 (en) * | 1998-05-08 | 2002-02-05 | Ventur Research & Development Corporation | Christmas light string |
US6480001B2 (en) * | 2001-03-20 | 2002-11-12 | Integrated Power Components, Inc. | Repair device for decorative light shunt |
US20020175666A1 (en) * | 2001-05-25 | 2002-11-28 | Virgil Benton | Method of locating defective sockets in a light strand |
USD467150S1 (en) * | 2002-02-26 | 2002-12-17 | Integrated Power Components, Inc. | Repair device for decorative light strings |
US20020195945A1 (en) * | 2001-06-22 | 2002-12-26 | Gershen Bernard J. | Voltage detector for series light circuit |
US6559605B2 (en) * | 2001-01-19 | 2003-05-06 | Jeng-Shyong Wu | Synchronous multiple serial-lamps sets |
US6561673B2 (en) * | 2001-05-14 | 2003-05-13 | Integrated Power Components, Inc. | Decorative light string with storage compartment for replacement components |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2230889B (en) * | 1989-02-03 | 1993-05-12 | David Phillip Dackowens | Display lighting |
US5102551A (en) * | 1991-04-29 | 1992-04-07 | Texaco Inc. | Membrane process for treating a mixture containing dewaxed oil and dewaxing solvent |
GB2284255A (en) * | 1993-11-29 | 1995-05-31 | Hor Kuang Flashlight Bulb Fact | Control of decorative lighting set |
US20040046510A1 (en) * | 1998-08-28 | 2004-03-11 | Fiber Optic Designs, Inc | Direct AC driven LED light string |
US20050110427A1 (en) * | 2003-11-24 | 2005-05-26 | Frederick W. R. | Decorative light strings |
-
2002
- 2002-03-13 US US10/479,010 patent/US20050024877A1/en not_active Abandoned
- 2002-03-13 GB GB0321899A patent/GB2389975B/en not_active Expired - Fee Related
- 2002-03-13 WO PCT/US2002/007609 patent/WO2002075862A1/en not_active Application Discontinuation
- 2002-03-13 CA CA002441278A patent/CA2441278C/en not_active Expired - Fee Related
-
2004
- 2004-10-08 US US10/961,302 patent/US20050122723A1/en not_active Abandoned
Patent Citations (75)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1974472A (en) * | 1927-07-16 | 1934-09-25 | Emiel P Seghers | Decorative lighting for christmas trees |
US2272523A (en) * | 1941-01-10 | 1942-02-10 | Gen Electric | Electric lamp |
US2760120A (en) * | 1955-10-26 | 1956-08-21 | New York Merchandise Co Inc | Lighting system for christmas trees |
US3063006A (en) * | 1960-06-20 | 1962-11-06 | Bernard F Steinberger | Circuit continuity tester |
US3214579A (en) * | 1963-03-04 | 1965-10-26 | Mario C Pacini | Christmas tree lighting systems |
US3723723A (en) * | 1971-01-04 | 1973-03-27 | Small World Importing Corp | Christmas tree electric light decoration set |
US3789211A (en) * | 1972-07-14 | 1974-01-29 | Marvin Glass & Associates | Decorative lighting system |
US3964040A (en) * | 1974-10-29 | 1976-06-15 | Vapor Corporation | Circuit for detecting burned-out lamp for a buoy lamp changer |
US4034259A (en) * | 1976-04-14 | 1977-07-05 | Audio Visual Innovators Corporation | Spare lamp control circuit for a light projection system |
US4233543A (en) * | 1977-12-09 | 1980-11-11 | General Electric Company | Internal shunt for series connected lamps |
US4241387A (en) * | 1977-12-09 | 1980-12-23 | General Electric Company | Lamp lead to wire attachment for integral string sets |
US4227228A (en) * | 1978-12-21 | 1980-10-07 | Albert V. Sadacca | Miniature socketed fuse for a decorative string of series-connected miniature incandescent lamps |
US4425605A (en) * | 1979-01-29 | 1984-01-10 | Sam Cheng | Decorative lighting string for assembly with overcurrent protection |
US4253233A (en) * | 1979-05-04 | 1981-03-03 | General Electric Company | Rapidly formed electrical connection |
US4340841A (en) * | 1980-05-22 | 1982-07-20 | General Electric Company | Internal shunt for series connected lamps |
US4350407A (en) * | 1980-05-22 | 1982-09-21 | Tung Ming Electrical Co. Ltd. | Safety lamp plug |
US5180952A (en) * | 1983-04-22 | 1993-01-19 | Nilssen Ole K | Electronic track lighting system |
US4646338A (en) * | 1983-08-01 | 1987-02-24 | Kevex Corporation | Modular portable X-ray source with integral generator |
US4608508A (en) * | 1984-08-31 | 1986-08-26 | Intermatch S.A. | Piezoelectric igniter, especially for a cigarette lighter or the like |
US4631650A (en) * | 1984-10-24 | 1986-12-23 | Ahroni Joseph M | Series-parallel connected miniature light set |
US4712586A (en) * | 1985-05-10 | 1987-12-15 | Mcgard, Inc. | Pipe plug and centering construction for centering ridged key in mating groove in pipe plug |
US4799177A (en) * | 1985-12-31 | 1989-01-17 | The Boeing Company | Ultrasonic instrumentation for examination of variable-thickness objects |
US4808885A (en) * | 1986-06-18 | 1989-02-28 | U.S. Philips Corporation | Electric incandescent lamp for series arrangement having an electrically conductive vitreous body connecting oxide coated current-supply conductors |
US4727449A (en) * | 1986-10-01 | 1988-02-23 | Chiu Technical Corporation | Filament bypass circuit |
US4862041A (en) * | 1986-10-15 | 1989-08-29 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen M.B.H. | Dimmable electronic transformer circuit |
US5070522A (en) * | 1986-10-22 | 1991-12-03 | Nilssen Ole K | Combined signal and power distribution system |
US4904904A (en) * | 1987-11-09 | 1990-02-27 | Lumintech, Inc. | Electronic transformer system for powering gaseous discharge lamps |
US4855880A (en) * | 1987-11-10 | 1989-08-08 | Mancusi Jr Joseph J | Electrically enhanced artificial tree |
US5387845A (en) * | 1988-04-01 | 1995-02-07 | Nilssen; Ole K. | Neon lamp power supply |
US4906901A (en) * | 1988-08-29 | 1990-03-06 | Gardenamerica Corporation | Power supply for outdoor lighting systems using high frequency |
US4943752A (en) * | 1988-09-08 | 1990-07-24 | Todd Philip A | Piezoelectric incandescent lamp test device |
US5065067A (en) * | 1988-09-08 | 1991-11-12 | Todd Philip A | Piezoelectric circuit |
US4870547A (en) * | 1988-10-21 | 1989-09-26 | Crucefix Michael D | Christmas tree lights |
US5032961A (en) * | 1989-02-27 | 1991-07-16 | Territoire De La Polynesie Francaise | Ground light system for a landing strip |
US4984999A (en) * | 1990-05-17 | 1991-01-15 | Leake Sam S | String of lights specification |
US5008626A (en) * | 1990-05-17 | 1991-04-16 | Boyd Sr William P | Direct current miniature lamp tester |
US5262697A (en) * | 1991-03-13 | 1993-11-16 | Laforest Bic, S.A. | Piezoelectric mechanism for gas lighters |
US5150964A (en) * | 1991-06-21 | 1992-09-29 | Tsui Pui Hing | Joy light structure |
US5179339A (en) * | 1991-08-16 | 1993-01-12 | Volk Jr Robert C | Holiday light bulb tester with light bulb socket insertable probes |
US5290986A (en) * | 1991-10-22 | 1994-03-01 | International Business Machines Corporation | Thermally assisted shorts removal process for glass ceramic product using an RF field |
US5369363A (en) * | 1992-06-23 | 1994-11-29 | Hey; Bill L. | Implement for removing and installing and testing Christmas light bulbs |
US5319312A (en) * | 1992-07-06 | 1994-06-07 | Segilia Rocco F | Apparatus for locating inoperative miniature bulbs in a string of bulbs |
US5317491A (en) * | 1992-08-03 | 1994-05-31 | Lee Kuo Hsing | Holder for string of electric lights |
US5365145A (en) * | 1993-08-09 | 1994-11-15 | Gael, Inc. | Emergency lighting system |
US5453664A (en) * | 1994-02-01 | 1995-09-26 | Harris; Geoffrey H. | Light string with improved shunt system |
US5729445A (en) * | 1994-02-07 | 1998-03-17 | Leica Mikroskopie Und Systeme Gmbh | Regulated power supply unit with an electronic transformer |
US5495147A (en) * | 1994-04-15 | 1996-02-27 | Lanzisera; Vincent A. | LED light string system |
US5458241A (en) * | 1994-09-02 | 1995-10-17 | Gary Products Group, Inc. | Storage device for decorative light string |
US5539317A (en) * | 1994-11-07 | 1996-07-23 | Jlj, Inc. | Circuit tester for Christmas tree light sets |
US5676250A (en) * | 1995-05-22 | 1997-10-14 | Walters; Darryl Kurt | Light string mounting storage system |
US5604436A (en) * | 1995-09-12 | 1997-02-18 | Henritzy; Charles L. | Christmas light string circuit tester |
US6065958A (en) * | 1997-01-22 | 2000-05-23 | Bic Corporation | Utility lighter |
US6095799A (en) * | 1997-01-22 | 2000-08-01 | Bic Corporation | Utility lighter |
US6097158A (en) * | 1997-06-03 | 2000-08-01 | Lightech Electronics Industries, Ltd. | Low voltage illumination system |
US6319056B1 (en) * | 1997-07-25 | 2001-11-20 | Robert K. Schunk | Stringer of decorative lights |
US6074244A (en) * | 1997-07-25 | 2000-06-13 | Crum; Frank Andrew | Stringer of decorative lights |
US5877618A (en) * | 1997-07-31 | 1999-03-02 | Applied Power, Inc. | Hand held non-contact voltage tester |
US6294934B1 (en) * | 1997-08-29 | 2001-09-25 | Rambus Inc. | Current control technique |
US5975717A (en) * | 1997-12-18 | 1999-11-02 | Minami International Corp. | Cascade effect icicle light set |
US6031742A (en) * | 1997-12-31 | 2000-02-29 | U.S. Philips Corporation | DC voltage converter with improved efficiency |
US6177786B1 (en) * | 1998-03-31 | 2001-01-23 | Fujitsu Limited | Power supply apparatus and method of controlling power supply circuit |
US6344716B1 (en) * | 1998-05-08 | 2002-02-05 | Ventur Research & Development Corporation | Christmas light string |
USD414291S (en) * | 1998-06-19 | 1999-09-21 | Gary Products Group, Inc. | Combination clip for decorative lights |
US6102551A (en) * | 1998-07-27 | 2000-08-15 | Minah International Limited | Christmas lamp assembly |
US6224228B1 (en) * | 1998-07-29 | 2001-05-01 | W. Richard Frederick | Key light |
US6116892A (en) * | 1998-08-28 | 2000-09-12 | Yang; John Jiin Chung | Safety flint-type lighter |
US6072280A (en) * | 1998-08-28 | 2000-06-06 | Fiber Optic Designs, Inc. | Led light string employing series-parallel block coupling |
US6157551A (en) * | 1998-11-09 | 2000-12-05 | Lightech Electronics Industries Ltd. | Electronic transformer for lighting |
US6095796A (en) * | 1999-12-02 | 2000-08-01 | Sung; Kil Yong | Double-button piezoelectric child-resistant cigarette lighter |
US6559605B2 (en) * | 2001-01-19 | 2003-05-06 | Jeng-Shyong Wu | Synchronous multiple serial-lamps sets |
US6480001B2 (en) * | 2001-03-20 | 2002-11-12 | Integrated Power Components, Inc. | Repair device for decorative light shunt |
US6561673B2 (en) * | 2001-05-14 | 2003-05-13 | Integrated Power Components, Inc. | Decorative light string with storage compartment for replacement components |
US20020175666A1 (en) * | 2001-05-25 | 2002-11-28 | Virgil Benton | Method of locating defective sockets in a light strand |
US20020195945A1 (en) * | 2001-06-22 | 2002-12-26 | Gershen Bernard J. | Voltage detector for series light circuit |
USD467150S1 (en) * | 2002-02-26 | 2002-12-17 | Integrated Power Components, Inc. | Repair device for decorative light strings |
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Also Published As
Publication number | Publication date |
---|---|
GB2389975B (en) | 2005-08-24 |
WO2002075862A1 (en) | 2002-09-26 |
CA2441278C (en) | 2009-12-29 |
US20050024877A1 (en) | 2005-02-03 |
GB0321899D0 (en) | 2003-10-22 |
CA2441278A1 (en) | 2002-09-26 |
GB2389975A (en) | 2003-12-24 |
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